Olympique Marseille keeper Steve Mandanda has ordered his side to keep close tabs on Arsenalâ€™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 Arsenalâ€™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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