Two changes from the side that thrashed Colchested United. In came Butcher and McCrory to replace Weir and Binnom-Williams.
Early on, five minutes in the Brewers had a great chance to get themselves in front. Duffy did the work down the left to pull it to Naylor on the edge of the box who side-footed his shot towards goal but it floated just wide.
There was a lengthy stoppage in play as Butcher went down with a head injury due to a high foot but he was able to carry on.
GOAL: The Brewers opened the scoring just after half an hour through the unlikely source of Damien McCrory! Nasser won a free kick just next to the byline which Duffy drilled to McCrory who drilled into the roof of the net, one from the training ground.
GOAL: The lead was doubled just seven minutes later..Naylor broke out of defence from a Millwall corner, played it to Nasser on the left who flicked it on to Duffy with the outside of his boot and carried on his run into the middle before firing into the far corner of Archer's goal!
Millwall were lucky to go in at the break just two goals down as Archer provided a great double save to deny Naylor and El Khayati from a corner.
HT: Burton Albion 2-0 Millwall
Timmy Thiele was introduced just four minutes into the second half after Beavon made way, it looked like an injury change.
Burton hearts were in mouths 15 minutes into the second half. Flanagan hand balled a shot towards goal, the referee blew for it, looked over to his linesman but a free kick was awarded, not a penalty. The resulting free kick was well blocked by El Khayati.
It looked like a third was here for the Brewers. O'Connor sprayed a wonderful pass out to El Khayati on the left who left Cummings on the floor before seeing his shot deflected just wide!
GOAL: Millwall clawed one back with 15 minutes to go. A corner was floated in and the Brewers failed to clear multiple times before Martin stabbed home.
In the final minutes, Beevers was sent off for Millwall for a second yellow.
FT: Burton Albion 2-1 Millwall
Ash's man of the match: Anthony O'Connor.