United peppered the hosts' goal in extra-time and finally found a way past inspired Norwich goalkeeper Tim Krul in the 118th minute when skipper Maguire directed home to seal a 2-1 win.

"It would mean everything (to win the FA Cup)," the defender said.

"I joined this club to win trophies. We're in a semi-final of the FA Cup, it's a great tournament, and we're going to look forward to it.

"Hopefully when the semi-final does come and whoever we're drawn against we play a lot better than we have done tonight.

"It was a difficult game and we made hard work of it. We weren't at our best and sometimes in cup games that happens.

"You've got to find a way to go on and get the victory and get through to the next round and we've managed it in the end.

"Like I said, we made hard work (of it). We weren't at our best tonight but we're in the next round."

Asked why they were not at their best, Maguire told the BBC: "I don't know. We had a tough game obviously with the heat in the Premier League but we made changes so we should have been fresh.

"I can't really point on a finger at the moment. We'll have to watch it back and analyse it.

"We played a little but slow and we tried to go through the middle too often, especially when we were trying to break down the 10 men – we needed to play wide a lot more and make a move.

"But in the end we've got there, we're pleased, we're in the semi-final and that's all that matters, really."

United are through to their 30th FA Cup semi-final – more than any other team in the competition's history – and manager Solskjaer's relief was clear.

"It's cup football for you," he said. "The game was not the greatest, not the spectacle, but I felt we kept the ball OK, but we didn't threaten enough, didn't create chances.

"But you're delighted that you're in a semi-final. We're in the last four.

"Good workout, we got minutes into many players, rested quite a few and some nice goals, good for Harry to get the winner."