As a United fan, I think United need to, rather than stopping Barcelona playing, make it so that Barca need to stop United playing, this United side is very good and extremely versatile. They have proven that time and again by adapting to the opposition and hurting them late on in games, which is how i expect this game to go. I think Barca will take an early lead and then United will come back in the second half and clinch it at the end, either 2-1 or 3-2 or something like that. I cant see a close fought game with goals at either end throughout. I think your formation is fantastic, somehow you seem to have players everywhere at once, and I think will need to counteract it if they want to fight you for the entire game