Jose Sosa is asking Besiktas to let him complete a transfer to Milan, according to Sky Sport Italia.
The Argentine creative midfielder is under contract until June 2018 and only arrived in Turkey two years ago from Metalist Kharkiv.
Sky Sport Italia claim Sosa is determined to make the move to Milan, where he is specifically requested by new Coach Vincenzo Montella.
In 2015-16 he scored an impressive nine goals in 41 competitive games for Besiktas, above all providing 14 assists.
Recently turning 31, he has already played in Serie A at Napoli in 2010-11.
He also had spells at Estudiantes, Bayern Munich and Atletico Madrid.