The Belgian was strongly linked with a move to the former club earlier this summer; representatives were reportedly set to fly to Manchester to complete a deal, but no deal ever transpired.
But according to Turkish-Football, Fellaini has an agreement in principle with Galatasaray to join them for free next summer when his contract expires, whilst also entering talks with Fenerbahce over a potential January move.
The 29-year-old’s role at Old Trafford is clear: to act as a bruising alternative when opponents are proving hard to break down through the middle. His cameo against Leicester City, for example, was a neat illustration of the disruptive influence he can have on games, and Mourinho clearly sees this as an important asset.
How he figures beyond this season, however, is something of a mystery. Mourinho will probably look to invest further in the middle and Fellaini, in turn, may want to secure a regular place elsewhere.