Teenage midfielder Jenkins remains sidelined with a back injury and captain and centre-half DeMerit is recovering from eye surgery.
Back-up goalkeeper Richard Lee is the Hornets' only other injury absentee and he is making good progress with his knee problem and could be back next week.
Rookie keeper Jonathan Bond, 16, will be on the bench again as back-up to regular number one Scott Loach, who lines up fresh from keeping two clean sheets for England's Under-21s over the last week.
Striker Heidar Helguson is back in one piece from international duty with Iceland and is likely to start alongside Danny Graham in attack.
