Borussia Dortmund coach Edin Terzic has sought to ease the tension with Manuel Akanji ahead of their Champions League clash with Borussia Dortmund.
Akanji left BVB for City this summer and hit out at his old club this week.
The Swiss said: "It wasn't an easy time for me. I was part of the team and had an ongoing contract, was focused and kept pushing in training. But the principle of performance no longer counted, I sat in the stands, no matter how well I trained."
In response, Terzic stated: "It wasn't an easy situation - neither for him nor for us.
"But it was a completely normal process. He informed us that he wanted to leave the club, so we responded and signed two new centre-backs."