Hello and welcome to Sports Mole's live text coverage of the Championship playoff semi-final second leg between Leeds United and Derby County at Elland Road.

The hosts take a 1-0 lead into tonight's clash thanks to a Kemar Roofe goal 10 minutes into the second half of Saturday's controversial first leg.

None of the previous 17 teams to have won the first leg of a second-tier playoff semi-final away from home has failed to progress to the final.

Who will join Aston Villa, penalty-shootout winners against West Bromwich Albion last night, in the Wembley final? We are about to find out!

LEEDS TEAM NEWS!

STARTING XI: Casilla; Ayling, Berardi, Cooper, Dallas; Hernandez, Shackleton, Phillips, Klich, Harrison; Bamford

SUBS: Brown, Clarke, Struijk, Gotts, Jansson, Bogusz, Peacock-Farrell

DERBY TEAM NEWS!

STARTING XI: Roos; Bogle, Keogh, Tomori, Malone; Holmes, Johnson; Wilson, Mount, Lawrence; Bennett

SUBS: Evans, Cole, Carson, Knight, Jozefzoon, Huddlestone, Marriott

KICKOFF:  Roofe, who has made a habit of scoring against Derby this season, misses out through injury and Forshaw is also absent, so in come Bamford and Shackleton. As for the Rams, Bennett replaces Nugent up top from the first leg - a change not many predicted, with Marriott on the bench.

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There is a terrific atmosphere inside Elland Road this evening for what is a massive match. There have been a couple of strong challenges already - this could be a busy evening for referee Anthony Taylor. Remember, the onus is on Derby to score.

YELLOW CARD!  I said it may be a busy evening for the referee! Five minutes in and Anthony Taylor reaches into his pocket for the first time today following Tomori's challenge on Bamford. However, the contact looked to be minimal. Bamford does have history for conning the officials, of course!

Derby keeper Roos launches the ball upfield and Berardi fails to clear the ball. Lawrence tries to catch out Casilla, who is off his line, but he is unable to keep the shot down. Berardi collided with the County attacker as he was pulling the trigger, though, so a free kick is awarded.

The free kick is poor but the visitors do win themselves a corner, which also comes to little. The Rams have already asked more questions of their opponents' backline than they did pretty much throughout Saturday's first leg!

The match is just starting to settle a little. Lampard will be happy with the start his side have made to the match, causing a few problems in the Leeds backline as Bogle wins his side another corner.

We are only 13 minutes in but Bielsa may be tempted to tinker with things slightly. Derby have not used this formation before this season - strange considering we are into the 48th league match - but it is working a treat. They are dominating possession.

Just 12% of the play has been in Derby's final third so far - they have dominated. Bielsa will not be happy if the match continues in this manner for another 10 minutes or so, though his side have had plenty of touches of the ball over the last couple of minutes.

CHANCE!  Ayling plays the ball out from the back and continues his run into the box. Klich spots his teammate but Ayling is unable to keep the volley on target. That was risky from Leeds, but it is something we have become used to this term.

For all of Derby's dominance in the opening quarter of the match, then, it is Leeds who have created the only real opportunity so far through right-back Ayling. United are now up to 57% in terms of possession, so it is more of an evenly-matched contest.

YELLOW CARD!  Things have boiled over for the first time - and possibly not the last time - as Malone pushes over Hernandez near the dugouts. The referee shows the Derby full-back a yellow, and Hernandez also enters Anthony Taylor's book for nudging his head into his opponent's chest.

Derby attacker Lawrence was also shown a yellow card amid all that drama for shouting at Hernandez while he was on the ground.

This match is not too dissimilar to the one we saw last night between Villa and West Brom, with very little between the teams in terms of chances. Bamford does well to charge past one opposition player, before getting dragged back by Bogle to win a free kick.

GOAL!  LEEDS 1-0 DERBY (STUART DALLAS)

LEEDS TAKE A GIANT STEP TOWARDS WEMBLEY! Philips' free kick is swung into the box from the left and Roos is unable to get to it. The ball comes back off the post and Dallas is the first to react, sending it into a half-empty net.

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YELLOW CARD!  Wilson wins the ball from Phillips, who clatters into his opponent on the ground - he knew exactly what he was doing and is rightly shown a yellow card. Mount's delivery is poor, swinging the ball straight out of play for a goal kick.

Leeds have won 22, drawn one and lost one of the 24 matches they have taken the lead in this season. The Rams need to score twice if they are to force extra time. The only positive for Lampard is that his side have another hour to score those two goals.

OFF THE BAR!  Leeds come within inches of scoring a third goal that would have killed off the tie for good. Hernandez lays the ball off for Klich, whose shot from 20 yards deflects off Keogh, loops over Roos and comes back off the underside of the crossbar.

YELLOW CARD!  Keogh gets tight to Bamford and the Leeds striker, just back from a two-match ban for diving, goes to the ground. Anthony Taylor thinks for a second or two and then decides to book Bamford for trying to con him. He is starting to build a really bad reputation.

In Bamford's defence there was some contact from Keogh, but it was the manner he chucked himself to the ground. The referee was justified to reach into his pocket.

SAVE!  Bamford carries the ball forward, miscontrols it on the edge of the box but still manages to get away a weak attempt that Roos is equal to. Prior to that, Bennett went to the ground off the ball but it is unclear why.

Brilliant defending from Tomori to prevent Bamford from a simple tap in towards the back post. The home team have looked very bright over the last few minutes as Harrison's cross from the left is inches out of Bamford's reach.

Derby have really struggled to keep their foot on the ball since Leeds edged in front, which is in completed contrast to the opening quarter of the match when they were on top. The task for the Rams is difficult, though it is far from impossible.

Hernandez gets the ball stuck under his feet on the left but eventually manages to cross the ball towards the back post, where Klich was waiting to blast it over the bar. That was the hosts' ninth attempt of the match, compared to one for Derby.

OFF THE POST!  Leeds make a real mess of defending the corner and Bennett guides his header towards the far post. It looks as though it is going to loop in but the post comes to the home team's rescue. That is a big let off for United.

DERBY SUB! Defensive midfielder Holmes is sacrificed for Marriott as Lampard goes with a more attacking setup. Lawrence fired wide from 25 yards just beforehand as County start to grow back into the game.

GOAL!  LEEDS 1-1 DERBY (JACK MARRIOTT)

WHAT AN IMPACT FROM MARRIOTT! On the field for just seconds, Marriott capitalises on an almighty cock-up at the back from Leeds to make it game on at Elland Road just before half time! Cooper and Casilla fail to deal with a simple ball and it runs for Marriott to roll into an empty net.

HALF TIME:  LEEDS 1-1 DERBY (2-1 ON AGGREGATE)

Leeds opened up a two-goal advantage on aggregate through Dallas' close-range finish 24 minutes in, but Marriott's goal from his first touch of the ball has made it game on at Elland Road. The Rams require one more goal in the remaining 45 minutes.

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Leeds struggled to cope with Derby's new formation in the opening quarter of the match, yet the only opportunity in that period of the game fell the hosts' way as Luke Ayling volleyed over from Mateusz Klich's cross after making a positive run into the box.

The Whites were in front 24 minutes in when Kalvin Phillips' free kick went right the way through the box, hit the post and Stuart Dallas was quickest to react to the rebound four yards out.

Derby, going with a diamond formation in the middle, lost all control of the game for the next 20 minutes as Leeds created a couple of good opportunities.

Klich hit the crossbar with a heavily deflected effort and Patrick Bamford, earlier booked for trying to con the officials by going to ground in the box, had a tame effort kept out from the edge of the box.

In a flash, though, and after hitting the post through a looping Mason Bennett header, County were back in the game thanks to an inspired substitution from Frank Lampard.

Less than a minute after coming on for Duane Holmes, Jack Marriott profited from a terrible mix-up at the back by converting into an empty net once Liam Cooper and Kiko Casilla failed to deal with a simple flick-on, rolling the ball into an unguarded net from his first touch.

BENCH WATCH!

LEEDS SUBS: Brown, Clarke, Struijk, Gotts, Jansson, Bogusz, Peacock-Farrell

DERBY SUBS: Evans, Cole, Carson, Knight, Jozefzoon, Huddlestone

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KICKOFF:  Derby get us back underway at Elland Road. The momentum is with the visitors and they have 45 minutes to find a goal to take the game to extra time. It is worth reiterating at this point that away goals do not count in the playoffs.

GOAL!  LEEDS 1-2 DERBY (MASON MOUNT)

DERBY LEVEL UP THE TIE!! Unbelievable! They scored a couple of minutes before half time and within seconds of the restart they are 2-1 up on the night. Lawrence is picked out on the edge of the box and tees up Mount. The Chelsea loanee lost control of the ball and then lost his footing, but he still managed to find the far corner of the net.

SAVE!  Talk about momentum shifting! Bogle gets in behind down the right and plays the ball into the middle. Leeds struggle to clear the ball and it drops for Mount to have a clean strike at goal. Casilla, at fault for the first goal, pulls off a very good stop with his leg.

Derby are swarming all over Leeds. The obvious question to ask is just how long can they keep this up? Leeds need to see out the pressure and hope that their opponents tire. The hosts are given the chance to counter but the move breaks down 25 yards from goal.

It is end-to-end stuff now in Yorkshire as both teams go all-out attack. Lampard changed tactics at the end of the first half and since then his side have been superb. Bennett helps the ball on for Marriott, but Casilla gets his hands to it first.

CHANCE!  The ball is pulled back for Harrison totally unmarked in the Derby box, but his shot is pretty poor and is aimed straight at Tomori in front of goal. Dallas has a shot saved by Roos and Hernandez's shot is charged down by Malone on the edge of the six-yard box.

This second half has been football at its very best - both teams are seriously going for it. Leeds have managed to gain control of the match and they are creating opportunities galore, as another shot comes in from range. Bielsa and Lampard need to use their second-half subs wisely.

PENALTY!  Bennett plays a one-two with Lawrence and is dragged back by Cooper before he can get on the end of the return pass. A penalty is awarded to the visitors!!

GOAL!  LEEDS UNITED 1-3 DERBY COUNTY (TOM LAWRENCE, PEN)

THIS IS ASTONISHING! Wilson tucks the penalty into the bottom right corner, sending Casilla the wrong way, to complete a remarkable Derby turnaround. They were 2-0 down on aggregate 44 minutes into the match - they now lead 3-2 with an hour played!

DERBY SUB! Huddlestone is on for Bennett as Lampard changes formation again, this time seemingly going a little more defensive. That is a big call from the Chelsea legend because his side look a lot better when they attack, rather than sitting back.

GOAL!  LEEDS 2-3 DERBY (STUART DALLAS)

LEEDS BACK ON LEVEL TERMS! Talk about showing character! Klich touches the ball into Dallas, who cuts inside between two opposition players and curls the ball away from Kroos into the bottom corner. Superb finish from the midfielder! It's 3-3!

CHANCE!  That sub from Lampard now has to be questioned. Leeds are all over Derby and should have a fourth of the tie. Ayling plays a one-two with Bamford but loses his footing in front of goal, miscuing his shot into the stands from close range. Mount is cautioned for his challenge on Dallas.

YELLOW CARD!  Berardi is the ninth player to be cautioned as he enters the referee's book for blocking the run of Mount. Wilson tries to get the ball into the middle but it hits the two-man wall. Replays for Dallas' second goal show he was marginally offside, though nobody appealed at the time.

Casilla is having an absolute shocker today. The ex-Madrid keeper gets nowhere near the ball when it is launched into the box but thankfully for him he is quickly on the loose ball. Marriott claims he was dragged down, which the referee disagrees with.

The atmosphere has become incredibly tense at Elland Road - and no wonder after what we have seen over the last hour or so. A loose ball drops for Ayling but he hammers the ball over the crossbar. There is definitely another goal in this match.

Replays show that Marriott had a claim a few minutes ago - he was dragged down by Berardi in the box. The referee has just showed a yellow card to one of Leeds' backroom staff, who chased after the linesman once he failed to spot an offside. It is all happening here!

It was Pablo Quiroga who was shown the yellow card, just to clarify - he is the longest-serving member of Bielsa's backroom staff. Leeds have now had 18 attempts to Derby's 11 - what an incredible game this has been. There could be another 45 minutes or so to play.

We are getting to the point now where the two teams involved would usually start thinking about keeping things tight ahead of extra time. That is not quite the case here as Leeds, who have momentum back on their side, are looking for what would surely be a winning goal.

RED CARD!  Berardi has been terrible today. The defender, already on a yellow, loses the ball and then lunges in on Johnson, getting nowhere near the ball. It probably should have been a straight red, but it matters little as he is shown a second yellow.

So with 10 minutes of normal time to play Derby will surely now push for a winner. Lampard's men were down and out with 44 minutes played, finding themselves two goals down on aggregate, but it would now be considered a bad outcome if they fail to win with a man advantage.

Derby are probing away for a winning goal but Leeds are also enjoying the odd promising moment on the ball. Bamford is penalised for knocking over Tomori - he has to be careful because he is also on a yellow and has already been warned by the referee.

OFF THE POST!  WAS THIS THE BIG CHANCE?! The ball is slotted through for Wilson and he passes it towards the bottom corner, but the post comes to Leeds' rescue. Wilson looked as though he was already celebrating!

GOAL!  LEEDS 2-4 DERBY (JACK MARRIOTT)

DERBY HAVE SURELY WON IT!!!! Well this just caps what has been an extraordinary semi-final second leg. Derby, moments after hitting the post, put together a good move that culminates in Keogh of all people prodding the ball through for Marriott, who lifted it over Casilla despite the angle being against him.

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LEEDS SUB! Bamford, who has been walking a tightrope, is replaced by Brown. Clarke also replaced Klich in the aftermath of Marriott's second goal, which as it stands will send Derby through.

Derby's supporters are the ones making all the noise now - and no wonder! They have seen their side save their best 45-minute display for their penultimate match of the season. They have surely done enough to set up one more match, with Villa awaiting in the final.

SAVE!  Roos can only parry Dallas's edge-of-the-box shot and Clarke is also kept out from the follow-up attempt. Leeds have another three minutes to find a goal that would send us through to extra time. The way this one has panned out, you would not bet against them scoring it.

RED CARD!  Malone slides in on Hernandez and is shown a second yellow card. It may not matter tonight but he will now miss the playoff final if Derby hold on for the next two minutes. Lampard will accept that if - IF - his side do indeed hold on. Wilson has been replaced by Cole.

SAVE!  Just when the game looked to be up, Clarke creates space and gets a shot away but it is a comfortable one for Roos to deal with at his near post. Time is now officially up. We are into added time in added time!

FULL TIME:  LEEDS 2-4 DERBY (3-4 ON AGGREGATE)

So there we have it - Derby County will play Aston Villa in the 2019 Championship playoff final. We were treated to a thrilling match at Elland Road, with the Rams coming out on top thanks to a remarkable second-half display.

They become the first ever side to lose the first leg of a Championship playoff semi-final on home soil and still progress through.

As for Leeds United, who led 2-0 on aggregate with pretty much a quarter of the two-legged tie to play, they must do it all over again next season - with or without Marcelo Bielsa

That concludes Sports Mole's live text coverage of events from Elland Road. An on-the-whistle report can be found by clicking here, and be sure to stick around as we bring you some reaction from both camps elsewhere on the site. Thanks for joining!