From The Scotsman, Rodgers explaining why he let Turnbull go:

"“It goes back to the summer, knowing where David was at in his thinking,” he said. “Obviously he was in the last year of his contract so I felt it was best for us and for him to get out and play. He has done well here. It hasn’t worked out quite how he wanted it to, but he is a good guy, he worked very hard and now he will have the chance to have a permanent place to play.”