Arsenal starting XI: Martinez; Maitland-Niles, Luiz, Holding, Tierney; Xhaka, Willock, Ceballos; Pepe, Aubameyang, Lacazette.
Arsenal substitutes: Macey, Sokratis, Cedric, Kolasinac, Torreira, Smith, Saka, Nelson, Nketiah.
Watford starting XI: Foster; Femenia, Kabasele, Dawson, Masina; Doucoure, Hughes; Sarr, Welbeck, Pereyra; Deeney.
Watford substitutes: Gomes, Mariappa, Cleverley, Chalobah, Cathcart, Joao Pedro, Gray, Quina, Pussetto.
Arsenal have Emiliano Martinez in goal, behind a back four of Ainsley Maitland-Niles, David Luiz, Rob Holding and Kieran Tierney.
Joe Willock comes into midfield alongside Granit Xhaka and Dani Ceballos, whilst Nicolas Pepe and Pierre-Emerick Aubameyang will support Alexandre Lacazette in attack.
Bukayo Saka is only on the bench, alongside Matt Macey, Sokratis Papastathopoulos, Cedric Soares, Sead Kolasinac, Lucas Torreira, Matt Smith, Reiss Nelson and Eddie Nketiah.
Watford are desperate for a result in their battle against the drop, and start with Ben Foster in goal behind a back four of Kiko Femenia, Christian Kabasele, Craig Dawson and Adam Masina.
Abdoulaye Doucoure joins Will Hughes in midfield, with Roberto Pereyra and Ismaila Sarr out wide. Danny Welbeck faces his former club, supporting Troy Deeney up top.
Joao Pedro is on the bench, joining Heurelho Gomes, Adrian Mariappa, Tom Cleverley, Nathaniel Chalobah, Craig Cathcart, Andre Gray, Domingos Quina and Ignacio Pussetto.
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