Arsene Wenger has made one change to his Arsenal team for the Champions League game against Olympiacos.
Theo Walcott returns to the starting line-up in place of fellow England international Alex Oxlade-Chamberlain.
Olivier Giroud retains his position as centre forward and former Olympiacos loanee Joel Campbell also starts.
Arsenal starting XI: Cech, Bellerin, Mertesacker, Koscielny, Monreal, Flamini, Ramsey, Walcott, Ozil, Campbell, Giroud
Substitutes: Ospina, Debuchy, Gabriel, Chambers, Gibbs, Iwobi, Oxlade-Chamberlain
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