Read our guide to another big game for The LionsMillwall head to Wales to face Cardiff City this Saturday (3pm) knowing that a win would take The Lions to within two points of the Championship safety zone.
Interim boss Neil Harris saw his side overcome relegation rivals Wigan Athletic 2-0 at The Den on Tuesday night and he will hope that Millwall can keep up the pressure on 21st-place Rotherham, who are not in action this weekend, with another three-point haul at the Cardiff City Stadium.
Millwall will check on the fitness of midfielder Shaun Williams, who limped off during the first-half of Tuesday's night victory over The Latics.
Ed Upson, who received a straight red following an altercation with Jason Pearce later in the same game, begins a three-match suspension, while Carlos Edwards (knee) remains a long-term absentee.
Cardiff boss Russell Slade has been without a number of first team players recently, most notably Federico Macheda, Alex Revell, Kagisho Dikgacoi and Ben Turner. The latter two, however, have recently come through Development Squad games and could be in contention for a return on Saturday.
Ex-Lion Scott Malone will be hoping to retain his place in the Bluebirds starting line-up against his former side.
Saturday's match marks the 64th meeting between Cardiff City and Millwall, and to date there is very little to separate the two sides when it comes to head-to-head stats.
The Lions do hold a slight advantage, however, having won 21 of the previous 63 meetings compared to Cardiff's 20.
Danny Shittu's headed goal secured all three points for Millwall when the two teams met in the reverse fixture back in October, but The Bluebirds are unbeaten in their last four against The Lions on home soil.
Visit Sky Bet for a comprehensive list of odds on the game.
Unable to make it to the Cardiff City Stadium? The Lions Player team will be bringing you full match commentary from 2.50pm, which you can access by clicking here.
You can also follow the action via @MillwallFC, the club's official Twitter account. Have your say before, during and after the game by tagging your tweets with #CCFCvMFC.