Erkin was bought from Inter. If he was kicked from Galatasaray before then already then he must have done something bad to deserve it. So it's obvious that is what I was worried about.
Inter bought him from Fenerbahce. We got him from CSKA Moscow in 2010. He played for Galatasaray on loan for a year before that.
He was kicked out of squad by the manager because he was acting disrespectful to him and causing unrest (at least that is what was said in the news). He went through divorce which might have played a part in his offensive behaviour, but that is no excuse to cause a stir in the team.
Edit: and yeah, he allegedly assaulted his manager verbally which was the last drop that spilled the cup.