Pablo Fornals opened the scoring within the first couple of minutes of the game, meeting a Ryan Frederick's cross. Andriy Yarmolenko doubled the Hammers' lead; chipping the ball over Ellery Balcombe from a perfectly-weighted pass from Said Benrahma.
A own-goal from Andy Butler reflected the poor Rovers' performance as the Hammers were comfortably heading into the fifth round.
A Ryan Fredericks attempt forced Balcombe into a low dive, pushing the ball into the path of Oladapo Afolayan who capitalised on the opportunity, scoring eight minutes into his debut.
Manchester United beat Liverpool in a five-goal thriller at Old Trafford, as the Red Devils went through to the FA Cup Fifth Round.
Mohamed Salah opened the scoring but was cancelled out by a wonderful Mason Greenwood finish past Alisson.
Marcus Rashford put his side ahead once again but this time it was Salah who equalised to bring the game back to levelled times.
However, a brilliant Bruno Fernandes free kick won the game for United.
French midfielder, Paul Pogba, is a doubt for the clash as he was substituted early in the Everton game due to a thigh injury.
Whilst Eric Bailly, who is carrying a knock, could also miss the game.
Arthur Masuaku will be missed again as he recovers from a successful knee operation.
Due to being cup-tied and also facing his parent club, Jesse Lingard cannot feature.
Manchester United: Henderson; Shaw, Lindelof, Maguire, Wan-Bissaka; Pogba, McTominay; Greenwood, Van de Beek, Rashford; Cavani.
West Ham United: Fabianski; Fredericks, Diop, Balbuena, Johnson; Noble, Rice, Lanzini; Bowen, Yarmolenko, Fornals.
Ones to Watch
Manchester United - Edinson Cavani
The striker has made 16 appearances for United and has scored six goals along with two assists.
With two goals in his last two games, the Uruguayan can cause difficulty to any team with his presence in the box. He adds an attacking threat with both feet and his head.
West Ham United - Jarrod Bowen
The energetic attacker has started all but two games this season for the Hammers, scoring five and assisting three so far. Despite not being up to his best in the last few games, Bowen has been vital to the Hammers' season.
He adds that certain dynamism which West Ham have struggled to find over previous seasons. Linking perfectly with the attackers around him, he has rarely put a foot wrong for the club.
West Ham United 1-3 Manchester United (5/12/2020)
Where to Watch
UK residents will be able to watch the game live on BBC One and BBC iPlayer on Tuesday, 9th February 2021, from 19:00 PM with the game kicking off at 19:30 PM.