MILLLWALL boss Neil Harris says what Burton have achieved so far this season is a "lesson" for other clubs.
Nigel Clough's side travel to The Den tonight with a four-point lead over Wigan at the top of the Sky Bet League One table having only been promoted from League Two last season.
Burton are also seven points clear of Walsall in third and look set for promotion to the second tier of English football for the first time in their history. They only reached the Football League in 2009.
Clough took over from Jimmy Floyd Hasselbaink in December after he went to QPR. Burton have maintained their form under their Clough, who managed them from 1998 to 2009.
"They've been brilliant," Harris said. "I think they're a lesson to anybody what you can achieve in sport with their organisation and work ethic. And don't forget they have quality, that's why they're top of the league.
"It's a tough test and with eight games to go you are where you deserve to be in the league, there's no doubting that.
"Our challenge is to beat the team that's top of the league. Over the years Millwall have been quite good at that.
"I'm focused on us. It's about what we do, making sure that we get the points to ensure we're in the top six at the end of the season."
Harris is pleased that Millwall quickly have the opportunity to put Saturday's 1-0 defeat to Bradford behind them as they look to boost their own promotion hopes.
"My players have been brilliant for me. We lost a game of football and the best thing for us is we play again Monday," Harris said.
"To have the league leaders is the best of all. We'll get over the defeat quickly. Obviously you want to keep the gap between you and the teams below you as big as possible.
"It was disappointing but there are going to be lots of twists and turns before the end of the season. We certainly look forward now, focus and make sure we play better on Monday night.
"My focus is on us giving everything we've got every game, which my players do, and then adding the quality which we've had the last couple of months which I thought let us down a bit (Saturday)."