A solitary Wayne Rooney goal after only 9 minutes was enough to finish off the Hammers and to send Manchester United into the fourth round to face Fulham.
Despite the defeat Hammers boss Sam Allardyce was pleased with his side’s performance.
“We need to keep our performance at this level. We had this level at Upton Park and nearly beat them there and we had a fantastic level of performance on Wednesday, but what I cannot accept was the level of performance we produced against Sunderland. We cannot have anything other than this on Saturday when we face QPR.”