I've only seen two matches in which he played, so I cant really say if he's good or not. In the matches I saw, he was very tough to beat in the air and had good positioning overall. Although he was a bit reckless with his tackles at times.
Overall he made quite a good impression in those two games, but I think we should look elsewhere for a new defender though. Someone more experienced would be the better choice IMO. It's probably a BS rumour anyway.
Also, this guy is a Serb, born in Bosnia, lived in America and has an American passport and now he's requesting German citizenship, and people complaining about Amauri wanting to play for Italy

.