4) Mikel Arteta v Shinji Kagawa
Although he was a relative flop for Manchester United, Shinji Kagawa was a revelation for Dortmund during his previous spell at the club. Playing in between the lines and looking to split the defence, Arteta will have to marshal the Japanese playmaker expertly, cutting off the supply to the forward players. Having scored on his debut Kagawa will be fired up for the clash, and probably feels he has a point to prove to English fans.