2) Mesut Ozil/Santi Cazorla v Lukasz Piszczek
Arsenal’s full-backs provide most of the team’s width, and consequently are asked to get forward regularly. This often leaves the flanks exposed, requiring others to track back. When Ozil and Cazorla are deployed on the left this can often be a problem, and if Gibbs is caught up the field Piszczek could have a field day down the right for Dortmund. Whoever Arsene Wenger chooses to play ahead of the English left back will have to be disciplined if Arsenal are to avoid an upset.