Robin van Persie extended the hosts’ lead after 22 minutes but it was halved before the break as Diafra Sakho took advantage of poor defending from Manchester United at a corner.
Rooney’s dismissal enabled the visitors to push forward in the final 30 minutes, and they had a goal disallowed late on when substitute Kevin Nolan was offside, but Manchester United were able to hold on to claim a second win under Louis #vanGaal.
Football : England – Premier League,West Ham United vs Man.UTD,watch match Click here
With injuries ravaging his squad, the Dutchman was forced into two changes in defence, with Paddy McNair and Luke Shaw coming in for their debuts in place of the injured Jonny Evans and the suspended Tyler Blackett.
#WestHam also made two alterations from their 3-1 win over Liverpool, as Morgan Amalfitano and #Diego Poyet were handed their first starts, but the visitors were not given time to settle and Rooney opened the scoring after five minutes.
West Ham: Adrian, Jaaskelainen, Cresswell, Jenkinson, Tomkins, Burke, Oxford, Noble, Song, Kouyate, Nolan, Amalfitano, Downing, Jarvis, Cole, Carroll, Sakho, Valencia
Man.UTD: De Gea, Valdes, Lindegaard, Evans, Smalling, Blackett, Shaw, McNair, Rafael, Rojo, Jones, Young, McNair, Mata, Di Maria, Herrera, Blind, Rooney, Fellaini, Valencia, Van Persie, Wilson, Falcao, Januzaj
Midfielder Michael Carrick remains Manchester United’s only injury concern ahead of Sunday’s Barclays Premier League trip to West Ham.
The 33-year-old has not played since the FA Cup fourth-round trip to Cambridge a fortnight ago due to a calf strain.
Defender Jonny Evans and winger Ashley Young returned to action after injuries in Tuesday’s replay victory over Cambridge at Old Trafford.