Fremantle breathed a sigh of relief on Tuesday when defender Nick Suban was cleared of any serious damage to his ankle.

It was initially feared Suban had suffered a serious knee injury when his leg and ankle twisted awkwardly under his body while being tackled in the dying minutes of Sunday's seven-point win over Geelong.

But his knee pulled up fine and scans showed no ligament damage to his ankle, although the 19-year-old is still expected to miss up to two weeks while his ankle recovers fully.

Suban's absence will be offset by the likely return of Chris Tarrant, who was a late withdrawal against the Cats with his own ankle injury.

The Dockers are unbeaten after three rounds for the first time ever in their history but ruckman Aaron Sandilands said talk of finals football was premature ahead of Sunday's top-of-the-table clash with St Kilda at Etihad Stadium.

"It's only three rounds into the season, there's still 19 rounds of footy left. It's very early," Sandilands said.

"But we're just happy that we are playing our style of play and everyone's contributing.

"I suppose it's always nice around the club when you win.

"We come up against one of the best sides in the comp this weekend and everyone's pretty determined to go over to Melbourne and play well.

"You always have expectations on you.

"The coaching staff tell you straight out where you're at and what you need to do, so I don't think it changes too much.

"I don't read too much about external expectations to be honest.

"It all comes from in-house and we know what we've got to do."

Fremantle's chances of success against St Kilda have been boosted by the absence of Nick Riewoldt through injury and Justin Koschitzke through suspension.

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