Brisbane coach Chris Fagan says the Lions have gone to school on why they gave away so many free kicks against Hawthorn last Sunday, but has no concern about his team's discipline.

Hawthorn earned 36 free kicks – to Brisbane's 27 - in its upset five-point win in Tasmania. 

Fagan said the Lions had spoken about it during the week in the build-up to Saturday's match against Greater Western Sydney at the Gabba.

"You can look at vision and see it might be a tackle technique thing, it might be a marking contest technique thing, so that's what we do," he said.

"We took the learnings from that. It's too many, 36 (sic) free kicks. Thirty-six free hits to start the play up. 

"It no doubt contributed enormously to what was a fairly narrow loss in the end, but those things do make a difference." 

Brisbane is now ranked third-last for free kicks against, conceding almost 24 a game.

However, Fagan doesn't believe it's a major issue, pointing to the fact its differential is just minus-one.

"You'd always like to get more than you give away, but our games tend to be fairly contested sorts of games and there's a lot of physical contact that go into those games," he said.

"So I think it's a natural thing that there'll be more free kicks in the game and there's a chance we might be in the negative from time to time." 

Brisbane has welcomed back Dan McStay (ankle) and Marcus Adams (health and safety protocols) to face the Giants, and included DevenRobertson to replace Hugh McCluggage (hamstring), who Fagan says will be available next week.