The midfielder, who has hit 37 goals in 78 games for the Turkish club, has an £18.4m option to buy Talisca but it is thought that he sees his future away from Turkish football.
"It's Mourinho. He wanted Diogo to play for United - that's all the influence that is necessary when a great club and a great manager are both willing to sign him", a source close to the player said. "And he was going to put the one in who was better".
A Manchester United star has revealed he held showdown talks with manager Jose Mourinho after finding himself on the bench at times during the past season.
Fellaini, 30, is set to become a free agent in the summer transfer market after rejecting several contract offers from Manchester United, and that has seen him being linked with a move to Arsenal, with other foreign clubs credited with an interest as well.
Defender Victor Lindelof has insisted that he has had "a good year" during his first season with Manchester United. "I don't know what's happening but if he joined Arsenal, I think he would be a good player for the new squad".
"Everybody is thinking me and the manager has a big issue or something, but it's not like that, me and the manager have a flawless relationship", Merson told Sky Sports.