A win for Gianfranco Zola's side could take them to within two points of second place, which is currently occupied by Queens Park Rangers.
Teenager Will Hughes is expected to return for the Rams, after he pulled out of the England Under-21 squad for their recent games against San Marino and Lithuania.
Derby County: WDLLD
Possible starting lineups
Watford: Almunia; Cassetti, Angella, Belkalem; Battocchio, Anya, McGugan, McEachran, Faraoni, Acuna Caballero; Deeney
Derby County: Grant; Smith, Keogh, Whitbread, Forsyth; Eustace, Bryson, Hughes, Ward; Martin, Russell
Sports Mole says 2-0