Francis Coquelin
Francis Coquelin went off against Chelsea but is set for a swift returnGetty Images

Arsenal midfielder Francis Coquelin is expected to be available for the Champions League visit of Olympiakos after making a quick return from a knee problem. The 24-year-old fell awkwardly during the loss at Chelsea and missed the wins over Tottenham Hotspur and Leicester City but has returned to training ahead of the resumption of the club's European campaign.

Coquelin trained with the Gunners' first team on the eve of the game and is likely to start at the heart of the midfield, with both Mikel Arteta and Mathieu Flamini suffering minor injury problems at the King Power Stadium. Arteta replaced Flamini after 21 minutes of the 5-2 Premier League win after the Frenchman picked up a hamstring injury, but both players have been ruled out of the game.

"Coquelin is back in training since yesterday but we will see," Wenger told a pre-match press conference, according to The Mirror. "He looks alright. Flamini and Arteta are not available, they have slight muscular problems."

Defeat to Dinamo Zagreb in their opening group game means Arsenal will be eager to belatedly kick-start their European campaign against an Olympiakos side who they have beaten in each of their three meetings at the Emirates Stadium. The Greek club have familiar names in the form of ex-West Bromwich Albion forward Brown Ideye and former Leicester City midfielder Esteban Cambiasso in their team, and Wenger has issued a rallying call to his squad.

"Already we must win," the Arsenal boss stated. "Have to win at home to qualify. As simple as that. Cannot afford to drop points at home now. Both teams will always try to go forward. At home teams try to regroup and you have to be clinical."

Aside from their injury problems, Arsenal will also be without the suspended Olivier Giroud, who will serve a one-match ban after he was sent off during the 2-1 defeat in Zagreb. Theo Walcott, who has three goals in all competitions this term, is expected to begin in attack.