Hosts Blackburn also enter the match in winning ways after Saturday's first-half demolition at Bournemouth, where the league's top scorer Jordan Rhodes added two more to his tally.
Victory for Watford could see them break into the top two, while Blackburn are looking to edge closer to the top six.
When these two sides last met back in April, Watford handed Blackburn a 4-0 beating.
Possible starting lineups
Blackburn: Kean; Kane, Hanley, Dann, Spurr; King, Lowe, Evans, Cairney; Best, Rhodes
Watford: Almunia; Ekstrand, Angella, Doyley; Anya, Murray, Iriney, McGugan, Pudil; Forestieri, Deeney
Sports Mole says: 2-2