London, England (SportsNetwork.com) - Arsenal midfielder Mathieu Flamini will miss Wednesday's Champions League clash against Borussia Dortmund due to a concussion, the club confirmed on Monday.
Flamini suffered the injury during Saturday's 4-1 Premier League win over Norwich City and will not be risked in Wednesday's critical Group F clash.
The Gunners opened their Champions League campaign with a 2-1 win over Marseille and then topped Serie A side Napoli, 2-0, at the Emirates to set up the match against Dortmund, who were beaten by Bayern Munich in last season's final.
"Flamini is doing well, has practiced normally, but we will not play him tomorrow," Arsenal boss Arsene Wenger said. "There is a five-days (concussion) rule that we will respect, not to take any chance. It was a concussion and the doctor advised us not to play him. He will be okay for the weekend."