BERLIN (REUTERS) - Turkish international midfielder Hakan Calhanoglu has joined Italian Serie A side AC Milan on a four-year deal from German Bundesliga team Bayer Leverkusen, the clubs announced on Monday.

There were no official details of the transfer fee but German media estimated it was €25 million (S$39.2 million).

The gifted 23-year-old Calhanoglu has not played since February after the Court of Arbitration for Sport upheld a four-month ban imposed by world football governing body Fifa over his contract dispute with Turkish club Trabzonspor from 2011.

Trabzonspor lodged a claim alleging Calhanoglu had breached the terms of his contract without just cause when he signed for German side Karlsruhe in 2011.

Calhanoglu was a minor at the time.

Calhanoglu was ordered to pay Trabzonspor €100,0000.

He joined Hamburg from Karlsruhe in 2012 and moved to Leverkusen two years later.

"The three years at Leverkusen were very emotional, Calhanoglu said in a club statement.

"The support was outstanding especially during my four-month ban."

"Now I want to start a new chapter in my career."