It is a must win game for Arsene Wenger's stadium as they are yet to collect full three points this season. After losing the opening match against Liverpool 4-3, they managed a 0-0 draw against reigning champions Leicester City.
They are struggling at the bottom half of the league table, very unusual of the Gunners who are among the title contenders in the league.
Watford's start to the season too has been pretty bad as they are yet to win a game. They started the season with a draw against Southampton and lost the second match against Chelsea FC.
Last week they came very close to bag full three points as Etiene Capoue's goal had gave them the lead. Unfortunate for them that Eden Hazard and Diego Costa scored in the ending moments to snatch away three points.
Walter Mazzarri is likely to field his team in 3-5-2 formation. He made quite a few changes in the starting line-up during the midweek game in the English Football League Cup against Gillingham. But today, he will likely stick to the same XI who had played against Chelsea last week.
Arsene Wenger most likely will bring in star attacking midfielder Mesut Ozil in the starting XI. The German superstar had joined the squad way back but Wenger did not field him as he joined late from the Euros. But now that two weeks have gone past and Arsenal's performance is not upto the mark, Ozil will be back in the starting XI.
The rest of the players are likely to remain unchanged with Alexis Sanchez as the front striker.
Watford FC starting XI
Goalkeeper: Heurelho Gomes
Defenders: Younes Kaboul, Sebastian Prodl, Miguel Britos
Midfielders: Etiene Capoue, Valon Behrami, Daryl Janmaat, Juan Zuniga, Adlene Guedioura
Strikers: Troy Deeney, Odion Ighalo
Arsenal FC starting XI
Goalkeeper: Petr Cech
Defenders: Hector Bellerin, Rob Holding, Laurent Koscielny, Nacho Monreal
Midfielders: Granit Xhaka, Franics Coquelin; Alex Oxlade Chamberlain, Mesut Ozil, Theo Walcott
Striker: Alexis Sanchez