A win for the Gunners tonight will see them move up to fourth in the table, just one point behind their London rivals Tottenham.
Arsenal lost to Everton in their last Premier League match and will hope to take all three points against the Hornets so as to improve on their chances of playing in the UEFA Champions League next season.
Watford, currently 10th with games in hand, are battling with the likes of Everton, Leicester, Wolves and West Ham for ‘the best of the rest’ title and a seventh-place finish.
Arsenal Team News
Arsenal will assess Granit Xhaka as the Swiss midfielder is battling a groin strain.
Sokratis Papastathopoulos begins a two-match domestic suspension after he collected his 10th yellow card of the season on Merseyside, while long-term absentees Hector Bellerin, Rob Holding and Danny Welbeck are all still out.
Watford Team News
Watford will be without Jose Holebas (hamstring), Domingos Quina (shoulder) and Tom Cleverley (calf) for this one, but Gerard Deulofeu is fit to feature after being taken off in the aftermath of his two-goal Wembley heroics.
Kiko Femenia, Isaac Success and Adalberto Peñaranda are also doubtful.
Watford vs Arsenal Possible Line-ups
Watford XI: Foster, Femenia, Mariappa, Cathcart, Masina, Hughes, Doucoure, Capoue, Pereyra, Deulofeu, Deeney
Arsenal XI: Leno, Mustafi, Koscielny, Monreal, Maitland-Niles, Guendouzi, Torreira, Kolasinac, Mkhitaryan, Iwobi, Lacazette