Arsenal will be sweating on the fitness of a number of players ahead of Sunday's Premier League clash against Watford.

Hector Bellerin (knee) missed the 2-0 Europa League win at AC Milan yesterday and is unlikely to recover in time while Nacho Monreal (back) is also expected to be absent.

Alexandre Lacazette (knee) is missing while both Sead Kolasinac and Calum Chambers came off injured in Italy. Pierre-Emerick Aubameyang is available for selection having been ineligible in Europe.

Provisional squad: Ospina, Cech, Holding, Mustafi, Chambers, Bellerin, Koscielny, Mertesacker, Nelson, Kolasinac, Maitland-Niles, Xhaka, Elneny, Wilshere, Ramsey, Ozil, Iwobi, Mkhitaryan, Welbeck, Aubameyang, Nketiah.