FREMANTLE is unlikely to get a clearer picture on Nat Fyfe's chances of being available for the Western Derby until at least Tuesday when the superstar returns to the club after suffering concussion in Sunday's five-point win over St Kilda.

A groggy Fyfe had to be helped from the ground in trainers' arms after coming off second best in a heavy head clash with Josh Battle on Sunday, ending his game midway through the third quarter.

With only a six-day break before taking on West Coast this Saturday night the Freo skipper is in serious doubt to be available.

Fyfe needs to pass a cognitive state test to be cleared to play, which he won't undergo until he presents to medicos symptom-free from concussion.

The Dockers players had a scheduled day off on Monday.

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On Sunday, the Freo skipper underwent a Sport Concussion Assessment Tool test – which can include memory, concentration and balance testing - as part of the AFL's concussion protocol at Optus Stadium, with the results then sent to the League.

After the match he spoke twice with coach Ross Lyon, who said Fyfe was "a little bit doey, but pretty good".

Fyfe didn't go to hospital and didn't need to see a specialist –  which would only happen if there are prolonged or recurring symptoms.

"Not sure if every club is different, but I know the doctor is flat out from the Monday onwards (after a player is concussed)," West Coast midfielder Luke Shuey said.

"There's a few different tests on the computer. You do a baseline test without a concussion at the start of the season, and I think if you cop a head knock through the year that's what your test is compared to – that's our club anyway.

"I think across all 18 clubs the protocols and systems in place are top standard and I don't think there's much room for error.

"I don’t think you'd see too many guys take the field if they're not fit to."

If Fyfe is ruled out it would be a major blow to the Dockers' hopes of arresting a seven-game Western Derby losing streak.

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The midfield bull was absent due to a hamstring strain last time the teams met in round 20 last year, when the Eagles' thumping victory was overshadowed by West Coast star Andrew Gaff's hit which broke Andrew Brayshaw's jaw and displaced five teeth.

West Coast's 58-point triumph was the biggest margin in the past 12 derbies since the Dockers won by 65 points in round 19, 2012.