Kieran is back after a calf injury while Jamie comes in again after a number of recent squad outings for the first team including an appearance on the bench at Sheffield United.
Six Academy players are in the squad including Under-16 winger Andros Townsend.
"Watford fielded a strong side in our match at Borehamwood earlier in the season and I expect they will be strong again," said development coach Clive Allen.
"We had a young side then and did well to pick up a draw, in fact we could have won it. The lads did well that night. This will be another tough test and that's what we want."
Kick-off is 7pm.
Squad: Burch, Forecast, Ifil, Archibald-Henville, Mills, Daniels, Mtandari, McKenna, Lee, O'Hara, Hallfredsson, Barcham, Martin, Hutchins, Townsend, Alex Smith.
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Kieran McKenna and Jamie O'Hara return to reserve action against Watford at Stevenage Borough FC tonight (Monday).