Sanchez told fulhamfc.com: "It's a catch 22 with the big four. More often than not teams go there to defend and get beaten because once a goal goes in they've got no other option than to attack and that opens a team up more and consequently they lose by more goals. I think Wayne Rooney said the other day that it gets boring playing at Old Trafford because teams just sit back and defend and we have to spend 90 minutes trying to open them up.
"If it becomes like that all of the time then I don't think it will benefit the League. We played two forwards against Chelsea and Arsenal and most teams go to those clubs and play with one forward. Liverpool did pin us back but we had efforts early on in that game.
"The facts of life are that United have a terrific home record but if you don't go there with some ambition you tend to leave with very little. I want my team to go to Old Trafford and have a go."