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The Gunners goalkeeper plays his last ever game, against his former club, before hanging up his gloves for good – and he is widely expected to return to Stamford Bridge in a technical role.
Meanwhile, N’Golo Kante has provided Chelsea with a huge boost by passing a late fitness test.
The Frenchman was a doubt for the Baku showpiece due to a knee injury – but he has been named in the starting XI.
Olivier Giroud gets the nod up front over Gonzalo Higuain, who appeared to be involved in a training-ground bust-up with David Luiz yesterday, while the Brazilian defender starts.
Eden Hazard features in what could be his last game for Chelsea before a highly-anticipated move to Real Madrid this summer.
Both teams are without key players: Arsenal midfielder Henrikh Mkhitaryan has stayed at home due to fears over his safety in Azerbaijan, while Aaron Ramsey is out injured.
Chelsea have injury concerns of their own, with Ruben Loftus-Cheek, Antonio Rudiger and Callum Hudson-Odoi all missing.