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Ronny Deila has spoken to the media for the first time since announcing his intention to leave Celtic at the end of the season, revealing the lack of improvement in the team prompted his decision.
Deila's future with the Glasgow giants was called into question following the club's defeat to Rangers in Sunday's William Hill Scottish Cup semi-final at Hampden Park and he announced his departure in a statement on Wednesday.
Although Celtic are eight points clear of Aberdeen at the top of the Scottish Premiership with five games remaining, they failed to qualify for the Champions League group stages and finished bottom of their Europa League section before the defeat to their Old Firm rivals.
"It has been a tough week, there has been a lot of thinking and it hasn't started this week either," Deila told reporters.
"I have been thinking about this for a while because I haven't felt the team has got the results they should have and, maybe more importantly, the performance and improvement I wanted.
"When I came in to the job I talked about improving the team and playing attractive football and I think the last six months we haven't had the improvement that we need."
The timing of the announcement has been criticised but the Norwegian believes ending the speculation about his future will help the team in their remaining games.
"Improvement is one of my biggest values and when you don't get it, it kills me inside and I lose energy with that," he explained. "I don't think there has been a lot of improvement and when you don't get improvement the outside pressure is going to get harder and harder as well.
"I have no problem dealing with that, I have been sitting in this room a lot of times and there has been a lot of difficult questions.
"That is not the problem, the problem is when you don't get improvements and the things you said you wanted to create when you came in the door, you haven't created.
"One of the reasons we haven't had that improvement is because of the pressure and speculation around me all the time.
"That is why I think it is best for the club that new energy is coming into the club next season and now we can really focus on winning the five games and getting five (titles) in a row.
"It is going to be a huge thing for me, the players and the whole club, this is why the decision has been made."