The former Chelsea youth was a key member of Bilic’s Besiktas squad last season which performed well both in Europe and finished third in the Turkish Super Lig.
Manchester City are also reported to be preparing a €7 million bid for the Beşiktaş winger according to NTVSpor.
The former Chelsea man is in the best form of his career. The Turkish international winger has nine goals and 11 assists in all competitions for the Black Eagles this season.
The explosive winger joined the Black Eagles from Kazan for £4 million this summer and still has three-years left on his contract.