Sam Skeffington scored the only goal of the game as Millwall's Under 23s defeated Colchester United 1-0 at Calmont Road in the Professional Development League on Tuesday afternoon.
The midfielder struck on the hour-mark to give Kevin Nugent's 10-man team all three points, after Harvey Bradbury was shown a straight red card in the second-half.
Frank Fielding played his first 90 minutes since withdrawing from the opening day meeting with Preston North End through injury.
The first-half saw both sides trade possession and chances, but with no real attacking intent. Reuben Duncan came closest for The Lions, whilst the most action at the other end came in the 29th minute as Junior Ogedi-Uzokwe tumbled in the penalty area - referee Mr O'Donnell, however, was not interested.
Matt Weaire wasted a golden opportunity to put The U's into the lead early in the second-half, and that was to prove pivotal as on 60 minutes, a powerful run down the wing from Isaac Olaofe saw a cut-back find Skeffington, who rifled past Callum Coulter to open the scoring.
The Lions' task of keeping their lead became harder nine minutes later, however, as Bradbury was given his marching orders for a tackle on Colchester's Ollie Sims.
Despite that, Millwall kept coming and looked for the killer second, going close through Olaofe. The majority of the possession went the way of the visitors from there, though, with Fielding having to pull off a magnificent save from substitute Tariq Issa seven minutes from time.
Nugent's side were to hold on, however, claiming another three Professional Development League points in the process.
Millwall: Fielding, Brown, Tiensia, Moss, Ransom, Strachan, Olaofe (Burey 80'), Skeffington, Alexander, Bradbury, Duncan (Topalloj 86'). Subs not used: J. Wright, Debrah.
Scorer: Skeffington 60'
Sent Off: Bradbury
Colchester United: Coulter, James, Sims, D. Wright, Weaire, Kensdale, Fernandes, Anderson (Issa 13'), Ogedi-Uzokwe (McLeod 62'), Dunne, Cowan-Hall (Scarlet 50'). Subs not used: Collins, Allen.
Booking: D. Wright
Referee: Mr C. O'Donnell