Fosu-Mensah returns to United from Fulham for knee surgery
Netherlands international Fosu-Mensah joined Fulham in August after a spell at Crystal Palace last season, playing regularly before Aaron Wan-Bissaka's emergence at right-back.
A versatile player who can play across the back four and in central midfield, Fosu-Mensah was seen as a shrewd acquisition by Fulham following their promotion.
But his performances at Craven Cottage have made him a regular target for criticism and he has played just 12 times in the Premier League, the latest against Everton on Saturday seeing him sustain a knee injury.
Fosu-Mensah requires surgery and his subsequent rehabilitation will be at United, indicating the defender's time at Fulham – whose relegation has been confirmed – is over.