NEIL Harris has promised to put his players through a tough pre-season regime in preparation for life back in League One for the first time in five years.
It gives an insight into the type of football he wants his side to play in what he believes is a physical and competitive division.
"We're going to be fit," the Millwall boss said. "Pre-season will be difficult for the players. They'll enjoy it, but it will be tough also. We're going to be a fit squad. Millwall teams are fit and hungry and work at a high tempo."
Harris was witness to a turbulent period after joining the club for the first time in 1998 when Millwall went through seven managers in six years and will take what he's learnt and apply it to the job of returning Millwall to the Championship.
"You only do what you feel is right. I take bits that I enjoyed and I take ideas from various managers and I've taken ideas from the staff as well.
"The sports science department play a big part, they've got the facts and the figures to what makes the players fit and what's going to work.
"It's a combined effort from myself and my staff."
Harris will also trust his own instincts when judging if a player is suitable for the club.
"I think you take as much information as you can, and you use that knowledge the best you can," he explained. "You will have to use the human eye as well; you have to trust yourself for what's best with your players.
"If the player looks physically shattered it is time to take a rest.
"It goes both ways: You use the stats definitely, that's the modern thing if it benefits you, but you trust your own opinion too."