Olympique Marseille keeper Steve Mandanda has ordered his side to keep close tabs on Arsenal's club-record signing Mesut Ozil. Following his impressive debut on Saturday, the Germany playmaker will make his Champions League debut for Arsenal in Marseille.
"Ozil has increased Arsenal's level in attack," said the France international.
"Also, Giroud is in a sensational moment of form. We have to stop them from scoring and creating danger but that will not be easy. They look a very strong team.
"This Champions League Group is terrific. For any club to progress, every game must be like a final and you have to win your home games.
"Unless you do that, you have no chance."
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