The match consisted of three thirty-minute periods and featured Gary Alexander, who scored the only goal of the game to ensure victory but also missed a penalty, and Danny Senda, who is hopeful of winning a new deal with The Lions.
The game also featured trialist Jack Smith but defender Zak Whitbread was noticeable by his absence.
Millwall starting XI: Forde, Dunne, Frampton, Craig, Barron, Hackett, Laird, Bolder, Martin, Abdou, Harris, Morison.
Millwall second XI: Sullivan, Senda, Smith, Beccles, Fitzsimons, Grabban, Tevfik, Fuseini, Hughes-Mason, Grimes, Alexander.