Wether or not Manchester United draw or lose this game to Chelsea they still won't be getting relegated as the three teams Southampton, Ipswich Town and Leicester city has already been certified as the relegation teams this season. But, what I believe Manchester United would be fighting for in this game is for the pride of Manchester against the west London side. It has mainly being a part of the rivalry aside fighting for points. Perhaps, a draw is likely but outside that am giving it to Chelsea if there happens to be a winner because they're the one fighting for a higher course and are most definitely going to give their all.
You have to see the other side of Manchester United because lately they have not been optimal when playing in the Premier League and we know the reason of course they prioritize the Europa League meaning I expect Man United will secure main players against Chelsea yeah at least to maintain stamina. On the other hand, Chelsea will take advantage of the moment of playing at home and 3 points must be obtained to be able to take 1 ticket to the champions league, if not then Aston Villa will take over the 5th place.