Goalkeeper Manuel Almunia made his comeback from a lengthy absence with a hamstring injury to retake his place between the posts for last weekend's goalless draw with Cardiff.
Midfielder Jonathan Hogg (calf) and defender Matthew Briggs (knock) also returned to Gianfranco Zola's 18 against the Bluebirds, with all three suffering no ill-effects.
Midfielder John Eustace has rejoined training after his long-term back injury but whether he features at all remains to be seen.
However, defenders Fitz Hall (hamstring), Nyron Nosworthy (Achilles), Neuton (dislocated shoulder) and Tommie Hoban (ankle) all remain sidelined.
The third-placed Hornets are currently just three points adrift of the automatic promotion places with 15 points left to play for.