WEST Ham boss Alan Pardew has warned supporters: "We only win when you're singing."

When Manchester United arrive at Upton park on Sunday he wants the stadium right behind his team to give them every possible advantage.

"There has to be a massive atmosphere for us to give us an edge when the game starts," said Pardew.

"We will need that edge because Manchester United are a better side than us. I saw them play at Charlton last week and I felt the crowd was apprehensive and that got to the players.

"Their supporters played no part, and all you could hear were the away fans singing their songs."