Arsene Wenger has made four changes to his team for Arsenal's Champions League game against Olympiacos.
David Ospina returns in goal for the Gunners, Francis Coquelin is back from injury, Gabriel starts after serving his suspension and Kieran Gibbs replaces Nacho Monreal.
Per Mertesacker is on the bench on his 31st birthday while Mikel Arteta and Mathieu Flamini miss out through injury. Olivier Giroud is serving a one-match ban in European competition.
Arsenal team: Ospina, Bellerin, Koscielny, Gabriel, Gibbs, Coquelin, Cazorla, Oxlade-Chamberlain, Ozil, Alexis, Walcott
Subs: Cech, Debuchy, Mertesacker, Ramsey, Monreal, Chambers, Campbell
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