The on-loan QPR striker has been sidelined since his second debut for the Hornets against Leicester last month, during which he scored twice before suffering a calf injury.
But Watford will be without teenage midfielder Ross Jenkins, who is set to see a specialist after suffering a back injury in last Friday night’s 4-1 win over Sheffield Wednesday.
Jenkins joins club captain Jay DeMerit on the sidelines as he continues his recovery from eye surgery.
The American centre-half hopes to return to action before Christmas.
Rookie goalkeeper Jonathan Bond, 16, will be on the bench again as Richard Lee has not recovered from his knee injury.