Arsenal midfielder Abou Diaby will be out for a further three weeks after suffering another injury blow.

The 25-year-old, who underwent ankle surgery in pre-season, has been hit with a hamstring problem, delaying an expected return to action this month.

"You won't see [Diaby] for a while, the next three weeks," said Wenger. "He will not play for France either.

"I am worried but I was more worried three months ago. His ankle was not good but the surgery went very well then.

"Now his balance has changed so he has to adjust his muscular strength. He has had two small muscular concerns and if he can get rid of them in the next two to three weeks he will be ready."

The Gunners prepare to face Marseille at the Emirates this evening.