The Swede was used sparingly after telling the club he would not be staying.
Celtic look set to let go their loanee striker John Guidetti this summer. The Swede arrived at the club from Manchester City last summer until the end of the season, with Celtic keen on a move for the player if the deal was a success.
The former Feyenoord loanee scored 15 goals in 35 appearances for Celtic, but only four of those goals came in 2015, with Guidetti struggling for form since the turn of the year.
He has now shed some light on that situation, suggesting his form dipped as his playing time diminished. He explained to TV4, as reported by Fotbollskanalen, that Ronny Deila decided to stop playing him as much after he made it clear he would not be staying at Celtic in 2015-16:
"I would have been starting, but the day before the game he said I would sit on the bench because I was not going to stay at the club.
"He said he would focus on the players who wanted to be there. I understood that."
"He told me that he could not play me. I would add to my goals and build my value.
"Then he would stand by his players who had not played. I understand that, but it was hard not to play football."
Now Guidetti is on his way out of Celtic he is also leaving Manchester City. His contract is up at The Etihad so is looking for a move elsewhere.
The likes of Marseille, Feyenoord and Trabzonspor have all been credited with an interest in the player - who is undoubtedly is a talented goalscorer.
Celtic are now hunting for a replacement in the attacking department.