Celtic manager Ronny Deila has admitted that his side performed poorly at both ends of the pitch during their 2-1 defeat at Dundee United.

The Hoops saw the defence of their Scottish Premiership title suffer a setback at Tannadice Park on Sunday as they were narrowly beaten by United.

Despite having a goal harshly ruled out for offside late on, Deila believes that his players only have themselves to blame for the result.

"Today it was two things that were most disappointing. We conceded two easy goals. We can't give them such easy goals as we did," he is quoted as saying by Sky Sports News.

"Secondly, it's the fourth match now that we have created eight to 14 chances, but when you score one goal that is way too little. We have to be more effective at putting the ball into the net."

Celtic are back in action on December 27 when they host Ross County in the league.