Manchester City coach David Platt has been impressed with the way that Matija Nastasic has adapted to English football.
The 19-year-old joined the Premier League champions from Fiorentina during the summer in a move that saw Stefan Savic travel in the other direction.
He has since gone on to keep England international Joleon Lescott out of the City starting lineup, something that Platt has praised.
"That is testament to [Nastasic]. He has stepped in," Platt told reporters. "The first couple of games he has had to get used to English football but he has done that very quickly.
"The really, really good performance - he has had several good ones, but the real one were it might have been a bit alien to him was when we went down to West Ham.
"You knew the ball was coming in, they were hitting the diagonal balls towards Andy Carroll and I thought he acquitted himself exceptionally well. You get that a lot in the Premier League that you don't get in Serie A and it shows there is an old head on young shoulders to adapt to that."
Nastasic has made six appearances for the Serbian national team.