Following last weekend's belting at the hands of Sydney, Fagan questioned his team's mental application, saying they thought victory would come easier than it played out.

Although the Lions have made a habit of rebounding strongly from heavy losses, the two-time premiership coach wasn't buying into it on Friday morning.

"If we fall for that, we've fallen for the same thing we fell for last week," he said.

"Credit to the group, that's what they usually do, but just because we've done it in the past doesn't guarantee that it's going to happen tomorrow.

"We need to turn up ready to go. 

"It's all about actions, it's not about talk. It's not about anything other than getting out there and playing with energy and effort."

Fagan said he had been pleased with the week's training, although he felt the same leading into the Swans match.

He was forced to make one change, with lockdown defender Noah Answerth sidelined with an ankle injury and replaced by young key-position player Ty Gallop.

Fagan said he reinstated Gallop to play alongside Harris Andrews, Darcy Gardiner and Ryan Lester and help combat the Crows trio of tall forwards in Riley Thilthorpe, Darcy Fogarty and Taylor Walker.

"We've always felt Ryan Lester can play that swingman role in defence. He can play small, he can play tall," he said.

"It'll come down to the collective and how fierce we are in the contest and how willing we are to bounce back from last week.

"They've done everything right this week … but at the end of the day you're judged by how you perform in the game."