Mesut Ozil will miss Arsenal's clash with West Brom due to a hamstring injury.
The German international suffered the injury towards the end of Friday's final training session before the game against the Baggies on Saturday, Goal understands.
Ozil has struggled with illness and injury over the past few weeks but played the majority of Arsenal's victory over Lincoln last week after replacing Alex Oxlade-Chamberlain.
Arsene Wenger has selected a strong line-up for the match at the Hawthorns with Danny Welbeck, Theo Walcott, Alexis Sanchez and Chamberlain making up a lightening fast frontline.
Aaron Ramsey continues in midfield alongside Granit Xhaka.
Arsenal starting XI: Cech; Bellerin, Mustafi, Koscielny, Monreal; Ramsey, Xhaka; Walcott, Chamberlain, Alexis; Welbeck
Subs: Ospina, Mertesacker, Gabriel, Coquelin, Elneny, Iwobi, Giroud