Fremantle coach Mark Harvey has given his unbeaten outfit the keys to the car but remains unsure whether they're good enough to pass Sunday's test against AFL powerhouse Geelong at Subiaco Oval.

"We are either L platers or P platers now," Harvey said on Wednesday as he added to his growing list of analogies.

"We are about to find out whether we can get our licence.

"It would be a good statement (if we win).

"It would be really enthralling for the team to know they could challenge and match it with a side like Geelong."

Fremantle enter the match with genuine belief they can win after posting impressive victories over Adelaide and Essendon to start the season.

The Cats will be without a number of premiership stars, including the suspended Matthew Scarlett and injured pair Darren Milburn and Travis Varcoe, but Harvey said he still couldn't find any chinks in the armour of the defending premiers.

"They haven't got any (weaknesses)," he said.

"They may well have four or five of their premiership players out but they've been very good at developing young players so I wouldn't have thought they had too many weaknesses no matter who they put into the side."

Dockers defender Chris Tarrant, who rolled his ankle in the dying moments of last week's win over Essendon, will be given until the eve of the match to prove his fitness.

Tarrant has become one of Fremantle's most important players since making the switch to defence last season and Harvey believed the 29-year-old should also be considered as one of the competition's elite backmen.

"If you compare it to say a side like Geelong who we are playing this week, he's probably as important as Scarlett is to Geelong," Harvey said.

"I think you are going to recognise him as one of the best defenders of the competition."

Harvey said Byron Schammer, Steven Dodd and Nat Fyfe were all chances to earn a call-up to replace the injured Garrick Ibbotson.

And either Kepler Bradley or Zac Clarke are a chance to return as back-up to dominant ruckman Aaron Sandilands, who will have his hands full against Geelong's pairing of Mark Blake and Brad Ottens.

"They've got two big ruckmen and it took its toll on (Hawthorn's Brent) Renouf last week so that will be a consideration," Harvey said.

Meanwhile, the good news kept coming for Fremantle with promising defender Nick Suban re-signing with the club for a further season, tying him to the Dockers until the end of 2012.

The No.24 pick from the 2008 national draft played every game in his debut season last year and has already established himself as a key player in Fremantle's defence.

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