Chelsea sold Christopher Nkunku to AC Milan in September for €42m, a deal that is increasingly looking beneficial for the Blues.
Nkunku, the France international, has failed to prove himself at AC Milan, with MilanLive reporting that he has become a "complete problem" for the Rossoneri.
He represents a "tactical misunderstanding" as Max Allegri prefers other options ahead of him in the 3-5-2 system.
Author's summary: Nkunku's move to AC Milan is not working out.