Watford could be heading for back-to-back away wins as they currently lead 1-0 at Millwall through a Lewis McGugan goal.
Having gone 14 games in all competitions without a victory on the road, McGugan fired Beppe Sannino's men into a 17th-minute lead after neat and effective and approach play from Albert Riera and Troy Deeney.
McGugan has had his shooting boots on in the opening period, firing wide on a number of other occasions while Gabriele Angella missed a good early opportunity when he headed a McGugan inswinging corner down and wide.
Sannino made two changes with Tommie Hoban replacing the suspended Marco Cassetti while McGugan came back into the side as Sean Murray dropped to the bench. However, they were forced into another change in first-half injury-time as Fernando Forestieri came on for the injured Ikechi Anya.
Millwall: Forde; Edwards, Dunne, Beevers, Malone; Bailey, Williams; Woolford, Garvan, Martin; Maierhoffer. Not used: Bywater, Robinson, Morison, Fredericks, Jackson, Abdou, Easter.
Watford: Almunia; Hoban, Ekstrand, Angella; Faraoni, Abdi, Tozser, McGugan, Riera; Deeney, Anya (Forestieri 45). Not used: Bond, Belkalem, Merkel, Ranegie, Murray, Pudil.