Premier League team news: Watford v Middlesbrough
Tom Cleverley is poised to make his second debut for Watford after joining the club on loan from Everton until the end of season.
The former Manchester United midfielder, who has featured just twice for Everton since November 5, spent the 2009-10 campaign on loan at the Hornets.
Goalkeeper Heurelho Gomes and defender Jose Holebas will be available for the visit of Middlesbrough after returning from illness, while injured trio Valon Behrami, Juan Camilo Zuniga and Stefano Okaka are also likely to feature.
Middlesbrough defender Daniel Ayala will miss thetrip to Watford after losing his appeal against the red card he received last weekend.
The Spaniard will sit out the next three games following his dismissal during Sunday's 3-0 FA Cup third round victory over Sheffield Wednesday.
He will be joined on the sidelines by defender Antonio Barragan (hamstring) and midfielder Gaston Ramirez (knee), although keeper Victor Valdes (knee) is available once again while winger Viktor Fischer is back in training after his own knee problem.
Provisional squads
Watford: Gomes, Pantilimon, Zuniga, Cathcart, Prodl, Britos, Holebas, Watson, Dja Djedje, Kabasele, Kaboul, Mason, Behrami, Capoue, Cleverley, Guedioura, Amrabat, Okaka, Doucoure, Kenedy, Ighalo, Sinclair, Deeney.
Middlesbrough: Valdes, Guzan, Chambers, Friend, Fabio, Nsue, Gibson, Espinosa, Fry, De Roon, Clayton, Forshaw, Leadbitter, Downing, Stuani, Traore, Fischer, Negredo, Gestede, Rhodes.