Arsenal midfielder Abou Diaby will miss the next three weeks through injury, beginning with tomorrow's Champions League tie against Olympiakos.
The France international picked up a thigh injury during Saturday's 2-1 defeat at the hands of Chelsea and was withdrawn after 17 minutes.
It is a blow for the 26-year-old, who had made a strong start to the campaign having been blighted by injuries during his time at the Emirates. As well as tomorrow's Champions League tie, Diaby will also miss the trip to Upton Park to play West Ham in the Premier League, although owing to the upcoming international break, could return for Arsenal's next match, against Norwich on September 20.
Arsenal may also be missing Mikel Arteta for the trip to Greece - the Spanish midfielder will take a fitness test on an ankle injury tomorrow.