The 27-year-old looks set to be available for the trip to Vicarage Road after missing Albion's Good Friday win over play-off chasing Leicester.
Striker Roman Bednar is pushing for a starting berth after shaking off a thigh problem to feature as a second-half substitute against the Foxes.
However, Bednar may struggle to displace Ishmael Miller, who has been in excellent form since returning from his own lengthy injury lay-off.
Robert Koren, Marek Cech and Chris Brunt are all expected to continue after also making their comebacks in Friday's match.
Victory over the Hornets will be enough to seal promotion back to the Premier League for the Baggies should Nottingham Forest fail to win against Cardiff.