In the best case scenario, they may even manage to stay in 6th place, if Man United continues to play very irregular games.
It's difficult with the rest of their games, I think Tottenham are more favourites than West Ham. But a Man United bug is very likely to happen. But if you look at West Ham's fixture schedule they have a more congested schedule because they still appear in the Europa League. Whereas in the EPL their chances are also tough because they have the rest of the game with a great team, similar to Man United but they have fewer schedules.