3. Angel Di Maria
A player who is so strong, quick and clinical is always going to be a problem for any team, but Angel Di Maria has played 33 games for Madrid in all competitions scoring six times and assisting teammates nine times. At just 24-years-old the Argentine is having another great season for Real Madrid, and United will need to keep an eye on the pacey winger. Di Maria is a goal threat to United but his real creativeness and strength lies in his crossing as well as his ability to assist teammates - the winger has started the European campaign impressively having assisted his team to three goals in just five games. The player is a crucial part to the team and will work solidly throughout both legs, perhaps feeding off the increased focus his team-mate Ronaldo will no doubt get. If United push too closely on Ronaldo, or choose to go man for man, that might open up some space for Di Maria, and that would spell disaster for United. He is a real threat to United and Ferguson will need to learn quickly how to combat his threat or it could cost the Manchester club.