Brisbane coach Leigh Matthews has watched three of his in-doubt players train safely after comparing some tough-talking from AFL underdog Geelong to kids trying to overcome their nerves.

Key Lions trio Clark Keating, Nigel Lappin and Alastair Lynch all completed a light, 30-minute session ahead of the preliminary final.

Geelong coach Mark Thompson has talked up the Cats' chances this week, even famously floating the idea of playing Cameron Mooney on Jonathan Brown as "one madman against another".

"Bomber's been saying a lot this week," Matthews said.

"It's like a bunch of kids trying to go into a haunted house - you've got to talk it up before you go in ... jeez, it's going to be easy ... there's no ghosts ... no ghosts.

"Geelong have done a lot of talking this week but the game's played tomorrow night.

"Once the game's on that's all that matters.

"And once the venue's decided and the opposition's decided, that's all that concerns us and all the planning's around that."

Keating and Lappin are carrying calf injuries while Lynch is hoping to overcome a hamstring problem but Lappin was the only player asked to do extra work, running a series of sprints from a standing start.

Matthews said he felt the three should all be fit to play, as long as they pulled up well after the session.

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