Wenger will be without defender Laurent Koscielny after the Frenchman's sending off in the last league game of the season. Gabriel will also miss out due to a knee injury, meaning Mertesacker could make his first start in 13 months.
Contributing to Arsenal's defensive woes, Kieran Gibbs has a thigh problem and is in contention, along with Oxlade-Chamberlain (hamstring), Granit Xhaka and Alexis Sanchez, the latter two expected to shake off their injuries and be fit for the final.
Shkodran Mustafi is struggling with an illness and will also be a late decision, so the all ayes will be on Rob Holding and Nacho Monreal, who might be called into central defence.
Possible lineup:
Arsenal: Cech, Holding, Mustafi, Monreal, Bellerín, Gibbs, Xhaka, Ramsey, Ozil, Welbeck, Alexis Sánchez.