Arsenal #TeamNews: Alexis Snchez and Walcott starts for Arsenal as Gabriel is dropped for Koscielny

Arsenal welcombe back Alexis Sanchez to the starting line-up for the Premier League match with Watford on Saturday, while Laurent Koscielny also returns, replacing Gabriel at the heart of the defence.
Alexis had been a doubt for Arsene Wenger's side, with a strenuous double header for Chile during the international break and a continuing groin problem, but the former Barcelona man is passed fit for the game.
Watford, meanwhile are unchanged form their 1-1 draw with Bournemouth last time out.
Watford: Gomes; Nyom, Prodl, Cathcart, Ake; Anya, Capoue, Watson, Abdi; Ighalo, Deeney.
Arsenal: Cech, Monreal, Koscielny, Bellerin, Mertesacker, Cazorla, Sanchez, Ozil, Ramsey, Coquelin, Walcott.