West Ham United midfielder Mark Noble has conceded that his side face a tough task in the third round of this season's FA Cup.
The Hammers will play Manchester United at Upton Park on Saturday evening - a side that have scored 54 goals in the Premier League already this season.
As a result, Noble knows that his team will have to be at their best defensively to stand any chance of reaching round four of the competition.
"It is anyone's guess how you stop them, with the service which goes up to Van Persie and Rooney, the players they have, they are brilliant," said Noble.
"We might have to build a wall in front of our goal, I don't know, but it will be a great night and we are all looking forward to it. This is the FA Cup and anything can happen."
West Ham last reached the FA Cup final back in 2006.
