Chelsea and United saw off Southampton and Tottenham in the semi-finals of the FA Cup, but only one of them can claim the silverware on 19 May. Cesc Fabregas believes he knows the secret to success.
"You have to feel the fire inside of you, the hunger you want to show on the pitch and this is something neither me or the coach can bring to the players," said the Spaniard.
"The fire - you have it or you don't have it and on Saturday we have to make sure everyone is on top of their game.
"It's the first day we are back training since the Newcastle defeat, obviously we need to play much better but I'm 100 per cent sure we don't even have to say that.
"But, it's a final, it's a big game and I feel that normally in those games you shouldn't have to motivate players to play football because we do what we love and we always have to do it 120 per cent.
"It's a final against United, on a big stage at Wembley, the last game of the season, you just have to go all for it."