Henrikh Mkhitaryan is set to make his first appearance for Arsenal since his transfer from Manchester United.
The Armenia international moved as part of the deal that saw Alexis Sanchez move the other way and is expected to feature against Swansea on Tuesday night at the Liberty Stadium.
Arsenal have also been boosted by the return of Olivier Giroud for the Premier League clash following a hamstring injury, but fellow forward Danny Welbeck (hip) is still missing, as is Santi Cazorla (Achilles).
Provisional squad: Cech, Ospina, Mertesacker, Holding, Mustafi, Koscielny, Chambers, Monreal, Mavropanos, Debuchy, Bellerin, Nelson, Kolasinac, Maitland-Niles, Wilshere, Xhaka, Elneny, Ramsey, Ozil, Iwobi, Mkhitaryan, Giroud, Lacazette.