NEIL Harris insists his players are fully prepared for tonight's match against Wigan, who he believes will pose a "different" challenge under new boss Gary Caldwell.
Caldwell, who made over 100 appearances for the Latics as a player, took charge of his first game against Fulham last week, overseeing a 2-2 draw.
Wigan fans had become increasingly frustrated with ex-manager Malk Mackay's long-ball tactics, so they were relieved to see their side have 62% possession at Craven Cottage.
And Harris says Millwall have to be mindful of the visitors' new style of play.
"We'll see a well-drilled, different Wigan side which is based on keeping possession," Harris said, speaking at the Lions' training ground yesterday.
"We expect them to have the ball at times, and then it becomes about how we hurt them.
"But it's not harder to prepare. Like I am, Gary is a young manager who is going back to good teams he played in and reverting back to what worked for him as a player.
"He's gone back to a possession-style of football where they want to keep the ball and open up the opposition. Gary's spoken quite rightly about the possession they had at Fulham.
"It's important that the fans who are coming to get behind us know that we might not have as much possession as Wigan, but it's what you do with your possession that's important.
"We'll have a nervous anticipiation about us but we won't have any anxiety in our play.
"We're focused, we know our responsibilities and we know our style of play. The players are ready for this sort of fixture."
The Latics are currently one place above the Lions on goal difference but have played a game more.
With time running out for both clubs in their battle against the drop, Harris admits tonight's clash at The Den is hugely significant.
He said: "Mathematically it's not must-win but realistically it's a huge game, not just for us but also for Wigan because they've played more games than us.
"They have to win but we're also desperate to win and I've made my demands clear to the players about what I expect from them.
"We're playing a team that's around us so the game might be edgy given what's at stake – it's crazy to think that we've got such a big night coming up 41 games into the season.
"I'm fired up for it and the players will be at 7.45pm tonight. They'll be ready for the challenge."