Mesut Ozil is unlikely to be available for Arsenal's trip to Manchester United.
Ozil did not train with the first team on Monday, and has been ruled out of Arsenal's last two matches with a back problem.
Granit Xhaka is suspended after picking up his fifth yellow card of the season in the victory against Tottenham. Nacho Monreal (hamstring), Konstantinos Mavropanos (groin) and Danny Welbeck (ankle) remain sidelined.
Provisional squad: Leno, Cech, Bellerin, Lichtsteiner, Holding, Mustafi, Papastathopoulos, Kolasinac, Maitland-Niles, Elneny, Torreira, Guendouzi, Ramsey, Smith Rowe, Iwobi, Mkhitaryan, Lacazette, Aubameyang, Nketiah.