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.
Since then he has found first-team opportunities limited, with just 21 appearances to his name for the Red Devils across all competitions.
Should his recovery from surgery be successful, however, Ole Gunnar Solskjaer might consider using the versatile starlet regularly next season, with the team's current defensive woes well documented.
The Red Devils have five matches left to play in the Premier League this term, with Everton up next at Goodison Park on Sunday.