Manchester United boss Sir Alex Ferguson admits Petr Cech was the difference for Chelsea in their FA Cup win yesterday.

Cech pulled off one of the saves of the season to deny Javier Hernandez's second-half header and keep Chelsea's 1-0 lead intact.

Ferguson said: "Cech's save from Chicharito was unbelievable.

"He made a similar save in the first (game) from one of his own defenders.

"I think if we had got that goal then we would have been okay.

"It may have gone to extra time, of course, but it would have brought us back into the game and we didn't need to go chasing it."