Watford will be without forward Cucho Hernandez for the Premier League match against Brentford because of a hamstring problem.
The Colombian was forced off late in the first half of last weekend’s home defeat by Leeds, with subsequent scans confirming the injury is a serious one and could see him sidelined for the rest of the season.
Forward Samuel Kalu is carrying a minor ankle injury, while defender William Troost-Ekong has picked up a slight hamstring strain and Francisco Sierralta (calf) will also miss out.
Brentford manager Thomas Frank will have Josh Dasilva available.
Dasilva had just returned to fitness before receiving a three-match ban for a red card against Newcastle on February 26.
Pontus Jansson is also ready to play but Frank Onyeka remains sidelined with an ankle problem.
Watford provisional squad: Foster, Femenia, Samir, Kabasele, Louza, Kamara, Sissoko, Kucka, Joao Pedro, Sarr, Dennis, Bachmann, Masina, Cathcart, Ngakia, Cleverley, Kayembe, King.
Brentford provisional squad: Raya, Ajer, Jorgensen, Pinnock, Henry, Janelt, Norgaard, Eriksen, Mbeumo, Toney, Wissa, Fernandez, Canos, Jensen, Ghoddos, Jeanvier, Dasilva, Baptiste, Sorensen, Roerslev.
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