The Red Devils activated a one-year extension clause in Fellaini's contract earlier this year to keep him at the club until the end of next season, but Galatasaray yesterday confirmed that they are in talks with the Belgian over a possible move.
However, after watching Fellaini score the opening goal during this evening's 3-0 pre-season friendly win over Valerenga, Mourinho stressed that there is "no chance" the player will leave Old Trafford.
"It's easier for Galatasaray to get me than Marouane. He is too important to me. No chance," he told reporters.