Fremantle need to set the bar higher if they are to challenge the AFL's best teams, according to senior coach Justin Longmuir.

A 64-point loss to Brisbane on Sunday at Optus Stadium showed Fremantle are were not ready to cope with the higher expectations that come with being in the top eight, slipping from eighth to 12th with the heavy defeat.

The Lions out-tackled Fremantle 71-35 and laid 25 tackles inside 50 to just six, overwhelming their opponents with forward pressure to create scoring opportunities. 

"I think sometimes as a player you read all the good press, you get all the pats on the back after a good effort last week," Longmuir said.

"It doesn’t take much of a lowering of preparation for you to get whacked in this game, especially when you come up against good sides. We got a lesson today."

Longmuir said Fremantle had a level of pressure they could handle from the opposition, but a theme of their season was that they couldn't absorb anything above that and still play their way.

"We need to set our standards a lot higher so we can start mixing it with teams that play at a top-four level, and they played at a top-four level today," he said.

"I think it definitely has something to do with the maturity of our group, it’s got something to do with the fact that what we are trying to do is not fully ingrained in them at the moment and not predictable to each other under pressure.

"I think our level of efficiency with the ball in hand gets questioned under real pressure from a top-four team."

Defender Nathan Wilson will undergo scans after being substituted out for a tight hamstring but has not been ruled out of next weekend's RAC Derby.

They come out of quarantine on Monday, which the coach said would help their preparation, while the Lions will stay in Perth awaiting directions on their next move from the AFL.

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