Watford will be without defender Younes Kaboul, who suffered a hamstring injury at the weekend which could rule him out for the rest of the season.
Troy Deeney and Sebastian Prodl might start after only being fit enough for the substitutes' bench on Saturday.
West Brom head coach Tony Pulis says he will make a late decision on the "one or two" unnamed players who picked up knocks against Manchester United.
Matt Phillips could be involved following a hamstring injury.
MOTD COMMENTATOR'S NOTES
John Roder: "A top-ten finish is certainly a target for West Brom, and it may well also be for Watford, who are only outside the top half of the table on goal difference coming into this match.