Fremantle have been installed as $1.03 favourites against struggling West Coast - the shortest odds offered in western derby history.
West Coast sit last on the AFL table with a 1-17 record and have been forced to soldier on without four of their best players: Jeremy McGovern (concussion, retired), Jake Waterman (shoulder), Elliot Yeo (ankle) and Oscar Allen (achilles).
But derbies can throw up funny results, and Fremantle's record against strugglers this season should give West Coast hope.
Fremantle boast a league-best 6-2 record against teams in the top half of the ladder, including last week's one-point win over Collingwood at the MCG where Pat Voss kicked six goals.
But when it comes to the bottom nine teams, Fremantle are 6-4, with two losses to Sydney and a defeat each to St Kilda and Melbourne proving costly.
In addition, the Dockers were almost beaten at home by North Melbourne and St Kilda during their recent six-match winning streak.
Longmuir feels he has the answer to why the Dockers haven't been able to exert their dominance against lower-ranked clubs this season.
"It's probably more about putting too much pressure on ourselves rather than taking things lightly," he said.
"I think we can always jump at the conclusion that, 'Oh, you took that opposition lightly and got punched in the face'.
"I don't think it's been that. I think it's been we've put too much pressure on the winnable games."
Fremantle (12-6) entered this round in seventh spot on the ladder, but just percentage adrift of fourth spot.
Of the teams in the top nine, Fremantle's percentage of 108.9 is by far the worst.
Unless they can boost it significantly over the next five weeks, it could cost them a top-four berth, but Longmuir dismissed the prospect his team were viewing Saturday's derby as a percentage booster.
"I tell you what, we have not talked about that. That would be disrespectful," Longmuir said.
"We haven't gone there at all this week, so don't even ask the question."
West Coast coach Andrew McQualter said his team would embrace their underdog status.
"Absolutely we do," he said.
"I'm not sure the last time a team that was $1.03 lost.
"But that's the beauty of this game - it's like a finals game. And for our team at the moment, we're obviously not going to get the chance to do that this year.
"So we appreciate being involved in games like this and can't wait for that experience."
McQualter revealed West Coast premiership star David Wirrpanda sat in on the team meeting this week.
The Dockers will be without tagger Corey Wagner, who will miss up to two weeks with a bruised heel.
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