Arsenal manager Arsene Wenger has relegated Petr Cech to the bench for his side's Champions League Group F clash against Olympiacos at the Emirates.
The former Chelsea goalkeeper is replaced in the Gunners' starting XI by David Ospina, one of five changes for the North London outfit.
Gabriel, Kieran Gibbs, Alex-Oxlade Chamberlain and Francis Coquelin have also come in, replacing Per Mertesacker, Nacho Monreal, Mathieu Flamini and Aaron Ramsey.
Meanwhile there are three changes for Olympiacos, with Omar Elabdellaoui, Esteban Cambiasso and Felipe Pardo coming in for Arthur Masuaku, Jimmy Durmaz and Luka Milivojevic.
Arsenal: Ospina, Bellerin, Koscielny, Gabriel, Gibbs, Cazorla, Coquelin, Oxlade-Chamberlain, Ozil, Sanchez, Walcott
Subs: Cech, Mertesacker, Debuchy, Ramsey, Monreal, Chambers, Campbell
Olympiacos: Roberto, Elabdellaoui, Botia, Siovas, Leandro Salino, Pardo, Kasami, Cambiasso, Seba, Fortounis, Ideye
Subs: Kapino, Finnbogason, Dominguez, Pulido, Masuaku, Vouros, Hernani
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