Like I said, United will use Park, Fletcher, Rooney and Valencia to stifle the Barcelona midfield. Lots of teams have tried but have failed. Even with defenders in midfield, teams have struggled to deprive them of the ball. what impressed me the most is their workrate without the ball. They press really well and they show the hunger to get it back.
Actually it all depends which Barcelona turn up on that day. I'm slightly concerned that Messi is really tired. They need to sew up the title double time to get some rest in between.