West Bromwich Albion have slipped five points behind the Championship play-off places with a five-match winless streak.
A win for Watford at The Hawthorns would see them overtake the Baggies in the table.
West Brom have won just one of their past 12 league games against Watford (D6 L5), and are winless in their past eight (D4 L4) since a 3-1 victory in December 2016 in the Premier League.
Watford have only won one of their past 12 league visits to West Brom (D6 L5), a 1-0 Premier League victory in April 2016.