The Italian manager made six changes in midweek as the Hornets failed to score for the first time in 14 games and were beaten 2-0 by Bristol City.
Zola is expected to recall 30-goal strike duo Matej Vydra and Troy Deeney, who were restricted to just half-an-hour at Ashton Gate.
Nat Chalobah, Marco Cassetti, Lloyd Doyley and Christian Battocchio are also pushing for returns to the line-up.
Midfielder Ikechi Anya (hamstring) and defender Neuton (back) will be assessed ahead of kick-off as they make their way back from injury.
Tommie Hoban is also closing in on a return from his Achilles injury, but Saturday is likely to come too soon for the defender.