Watford winger Gerard Deulofeu is in contention for a first appearance of the season for the Premier League match against Bournemouth.
Deulofeu has seen his recovery from a foot injury hampered by a hip and abdominal problem, but should be available along with Stefano Okaka, Miguel Britos and Sebastian Prodl, who have all resumed training.
Defender Marc Navarro has picked up a minor fitness issue, so will not feature, while Daryl Janmaat (knee) and midfielder Tom Cleverley (Achilles) both continue their own rehabilitation.
Provisional squad: Foster, Cathcart, Kiko, Holebas, Kabasele, Doucoure, Hughes, Capoue, Pereyra, Deeney, Gray, Gomes, Masina, Mariappa, Sema, Chalobah, Success, Deulofeu, Okaka, Britos, Prodl.
Bournemouth have no fresh injury concerns ahead of the visit to Vicarage Road.
Winger Junior Stanislas, fit again after knee surgery, came off the bench to score a late penalty in the 2-1 win over Crystal Palace on Monday night so should feature again.
Left-back Charlie Daniels is closing in on a return from his knee problem, while midfielder Kyle Taylor (calf) also continues his rehabilitation.
Provisional squad: Begovic, Francis, S Cook, Ake, A Smith, Lerma, L Cook, Brooks, Fraser, Wilson, King, Boruc, Rico, Gosling, Surman, Stanislas, Mousset, Defoe.