Brentford have no new injury concerns, although Ivan Toney will miss a second successive match because of a positive test for Covid-19.
Sergi Canos is suspended after he received a fifth booking of the season during the draw at Leeds United.
Watford have been boosted by the news that Adam Masina will only miss "a short period" with the thigh strain sustained against Chelsea.
Ken Sema is back in full training after a knee problem and could be involved.
MATCH FACTS
Head-to-head
- Brentford's 2-0 win against Watford in the Championship last season was their first in this fixture since 1977.