Manchester United "will be in trouble" in April and May if they continue to progress in the Europa League and the FA Cup.
This has been revealed by Man United manager Jose Mourihno.
Mourinho is worried about fixture congestion towards the end of the season.
United have played 38 competitive games this season, including 25 in the Premier League, five in the EFL Cup and two in the FA Cup.
Meanwhile, Man United defeated Watford earlier this week 2-0 in the English Premier League, their next match against Manchester City has been postponed.