George Alexander's second-half strike secured a 1-0 win for Millwall's Under 23s over 10-man Watford at Wingate & Finchley FC in the Professional Development League on Friday afternoon.
Alexander struck in the 62nd minute to hand Kevin Nugent's side all three points, despite Tom Leighton's attempts to clear the ball off the line twice.
Nathaniel Chalobah was shown a straight red card late on in the first-half for a two-footed lunge on Jethro Hanson.
Next up Nugent's outfit is a home game against Crewe Alexandra at The Den on Tuesday afternoon. Ticket selling details will be confirmed in due course.
Millwall: Amos, Hanson, Tiensia, Donovan, Debrah, Parker, Duncan, McKee, Alexander, White (Faniyan 60'), Saunders-Henry. Subs not used: Topalloj, Sandford, Mitchell, Skeffington.