"You go into matches knowing that if you don't play well, there's always somebody waiting to take your place. We all have to keep our performance level up to get picked for the next game.
"If we do lose one or two players, it doesn't make any difference. Any two from six could play and you'd still have the same outcome."
When asked if this was the best midfield he had played in at Old Trafford, he said: "It's hard to say. I think we've always had competition, like when Nicky (Butt), Roy (Keane) and (Juan Sebastian) Veron were all here. They were all top midfielders and it was hard to get into the team. I think it's the same now."