Fremantle coach Ross Lyon has labelled skipper Matthew Pavlich a 50-50 chance to line up in the Dockers' crucial clash against North Melbourne on Sunday.
Pavlich was named and flew out with the team on Friday but did not train with the main group earlier in the day.
The 30-year-old received a series of knocks to his leg in the Dockers' win over Richmond last week and limped noticeably after the match.
Lyon said after the match Pavlich had been struggling with hamstring and Achilles tightness and is a week-to-week proposition.
Fremantle's squad of 25 included Zac Clarke, Cameron Sutcliffe and Dylan Roberton as travelling emergencies.
Lyon said Fremantle was eradicating any risk by taking a squad of 25.
"Last time we were over there we lost one on the ground warm-up and (Paul) Duffield had to come off for injections, so it's potentially two," he said.
"We've planned an alternative, or we've got a plan with our emergencies and what's the best way to go.
"The obvious one (change for Pavlich) is Zac Clarke but we've got a few alternatives, so we'll have a look at them."
Coleman Medal leader Pavlich has not missed a game for Fremantle this season and has booted 60 goals, which included three last week against Richmond.
A light run around will decide whether he is fit to face the Kangaroos.
When asked what Pavlich has to do to play Lyon said: "Walk in and say, 'coach I'm happy to play'.
"We won't take anyone that can't perform in. Once you nominate yourself you're fully fit, so that's the way it works.
"He's in pretty good nick so I expect him to play. Once you declare yourself, you're fully fit.
"I'll leave it to the experts. Let the cobblers do the cobbling."
Ryan Crowley travelled despite rolling his ankle at training on Wednesday.
Crowley is expected to play an important role against an in-form North Melbourne midfield.
Tendai Mzungu also boarded the flight after he finished last week with a shoulder injury.