Mourinho won three trophies in his first season in charge at United.
He told The Telegraph: "I won a Europa League final with (long balls from) Sergio Romero to Marouane Fellaini.
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"Ajax pressing but pressing oxygen because the ball was not there.
"Ball to Fellaini's chest. Play from there. Two-nil. Bring the cup home. Three titles. Disaster of a season."