Mesut Ozil has been handed his first start of the season for Arsenal’s trip to Watford.
Arsene Wenger continues with the partnership of Laurent Koscielny and Rob Holding in central defence, with Santi Cazorla lining up alongside Granit Xhaka in midfield.
Alexis once again leads the forward line, flanked by Theo Walcott and Alex Oxlade-Chamberlain.
Francis Coquelin drops to the bench, where he is joined by Jack Wilshere and Olivier Giroud.
Arsenal team: Cech, Bellerin, Holding, Koscielny, Monreal, Cazorla, Xhaka, Walcott, Ozil, Oxlade-Chamberlain, Alexis
Arsenal substitutes: Ospina, Chambers, Gibbs, Coquelin, Elneny, Wilshere, Giroud