Simon Grayson is confident Leeds can overturn their slender first-leg deficit and book their place in the League One play-off final.
A 71st-minute strike by Neil Harris gave Millwall a 1-0 win in the semi-final first leg, which saw Leeds create few chances.
But cheered on by a bumper crowd for Thursday's return leg, Grayson is optimistic his frontline will do enough to get United through to Wembley.
"I thought it was a good performance without possession of the ball," he said. "We worked hard, looked organised and were difficult to break down.
"With the ball, we possibly could have played a bit better, but it's a play-off semi-final, it's hurly burly with a hostile atmosphere and you're going to be on the back foot at times.
"I thought we defended ever so well, but in the attacking side we were probably a bit short of what we are capable of doing.
"I said that if we we're still in the tie after the game today then we can turn it round and we still are in the tie," Grayson added.
"We know now what we've got to do. We've got 90 minutes to turn a 1-0 deficit into a positive for us and we've got players that are capable of doing that.
"We've got 37,000 at Elland Road on Thursday night, which is going to be some atmosphere. That isn't going to get us through the game but it will help."
Harris' late winner sparked a mini-pitch invasion at the New Den, with some taunting Leeds goalkeeper Casper Ankergren, but Grayson had no complaints.
"You know that in play-off semi-finals the atmosphere is quite hostile and people get exuberant," he said.
"I thought the authorities handled it well and our players didn't respond to anything.
"I'm just here to protect my players, they're all ok and nothing much was made of it."