The Red Devils forced a replay, after Anthony Martial scored late to cancel out Dimitri Payet’s stunning free-kick on Sunday.
If Louis van Gaal’s men defeat the Hammers, they will come up against Everton who eliminated Chelsea.
Watford’s reward for beating holders Arsenal, is a clash against Crystal Palace.
Both ties will be played at Wembley on April 23 and 24.
FA Cup semi-final draw:
Crystal Palace v Watford Everton v West Ham or Man Utd
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