The second leg tie of the Champions League round-of-16 clash is set to be an interesting affair after both teams played out a 1-1 draw in the reverse leg.
The current contract of the England international runs until June 2023 with the option to extend for one more season.
Against Watford, Manchester United had 22 shots and failed to score even a single goal at home against a team who sit 19th in the table.
Manchester United defeated Leeds United 4-2 on Sunday to boost their chances of Champions League qualification.
The charge stems from an incident in which United players surrounded the referee after Lewis Dunk's challenge on Anthony Elanga.
Manchester United drew 1-1 with Southampton and the Old Trafford crowd was not having it. This makes it their third draw in nine days.
United have found themselves struggling against lower league teams or bottom clubs in the Premier League, particularly since Sir Alex Ferguson's departure from the club.
Greenwood, 20, will not play or train for United while police and the club investigate the circumstances surrounding the evidence.
The statement from the Premier League club was issued in response to the allegations being put against Mason Greenwood.
The 28-year-old was last seen in action in a 2-2 draw with Atalanta in early November before suffering an injury while on international duty.