Manchester United defender Rio Ferdinand believes Fulham's failed spotkick claims on Monday night could prey on Manchester City minds.

He recalled a game at West Ham in December 2006 when Chelsea come back to win 3-2 against Everton, and a deflated United were beaten at Upton Park - even though they went on to win the title.

"I've been in that position before," said Ferdinand. "I remember playing at West Ham a few years ago when we went out for the warm-up.

"Everton were winning 2-1 against Chelsea and when we came in we found out it had been reversed. Chelsea won the game and it killed us a little bit. We ended up losing to West Ham that time so, yeah, psychologically it can affect teams.

"But we don't care what happens with them, it's about us. If we remain calm and win all our games, we'll be successful."