Ben Marshall scored his first Millwall goal as The Lions made it four away Sky Bet Championship victories on the spin with a 1-0 win at the Pirelli Stadium against Burton Albion on Saturday afternoon.
A tight and scrappy contest was low on clear-cut chances, but Marshall poked home the winner in the second-half to extend Millwall's unbeaten run to eight matches.
Neil Harris chose to keep his side the same for the third game running, meaning Tim Cahill once more took his place on the substitutes' bench.
The game was just four minutes old when Mahlon Romeo's through-ball looked to have set George Saville on goal, but Albion goalkeeper Stephen Bywater rushed out to punt away on the edge of the penalty area.
Steve Morison crossed for Lee Gregory on 11 minutes, but Lucas Akins was on hand to head behind. Akins could have given the hosts the lead nine minutes later, but his shot was lofted on to the roof of Jordan Archer's net.
Morison found himself one-on-one with Kyle McFadzean halfway through the first-half, but couldn't beat the defender after twisting and turning in an attempt to get a shot on goal. A minute later, a hopeful ball forward from Bywater allowed Darren Bent in on goal, but after momentary hesitation from Jake Cooper, the defender recovered superbly to execute a goal-saving challenge on the former Charlton forward.
A goalmouth scramble ensued on 34 minutes as Cooper powerfully met a Shaun Williams corner-kick, but The Lions could not force the ball home, with Burton saved by referee Robert Jones' whistle.
Six minutes before the break, The Brewers could - and perhaps should - have taken the lead, but Bent sliced his shot wide with only Archer to beat. Hope Akpan also headed wide shortly after and Cooper had to clear from under his own crossbar as the home side looked to nose theirselves in front before the whistle.
Four minutes into the second-half, Williams and Cooper combined once more, with the latter's header saved by Bywater; from the follow-up, a combination of bodies attempted to turn the ball home, but it was turned behind as Burton lived dangerously.
Gregory stole the ball away from Akins on 52 minutes and looked to set his sights on goal, but Tom Naylor was there to poke a foot out and stop the frontman in his tracks. Two minutes later, at the other end, Shaun Hutchinson became the second Millwall man to clear from under his own crossbar as Albion looked to take the lead.
On 61 minutes, The Lions nudged themselves in front in the scrappiest of circumstances. Morison sent Wallace away down the left-hand side and after the winger cut back on to his favoured right foot, he crossed in for Marshall, who bundled the ball home from inside the penalty area.
With 69 minutes on the clock, Gregory beat Bywater to the ball out on the left-hand side, but his shot lacked conviction and rolled across the box to safety. Substitute Fred Onyedinma breached the last line of Burton's defence on 73 minutes, but curled a stunning strike agonisingly wide of the post in The Lions' search to make the game safe.
On 78 minutes, Burton could have levelled through Naylor, but he planted his free header over the crossbar. Albion pushed forward as the game reached the dying embers and could have equalised in fortunate fashion on 82 minutes, but Hutchinson's sliced clearance thankfully went wide after Lloyd Dyer fired towards goal.
Cahill and Jason Shackell were introduced late on to cement Millwall's position, which they did to claim another priceless victory on the road.
Burton Albion: Bywater, Brayford (McCrory 19'), Allen (Boyce 70'), McFadzean, Bent, Akins, Dyer, Naylor, Davenport, Samuelsen (Varney 85'), Akpan. Subs not used: Campbell, Murphy, Buxton, Sbarra.
Millwall: Archer, Meredith, Hutchinson, Williams, Gregory (Shackell 87'), Romeo, Wallace, Morison (Cahill 79'), Saville, Cooper, Marshall (Onyedinma 65'). Subs not used: Martin, McLaughlin, Tunnicliffe, Elliott.
Booking: Marshall, Cahill
Scorer: Marshall 61'
Referee: Robert Jones
Attendance: 4,105 (1,452)