Geelong speedster Max Holmes remains under some doubt to face Sydney in Saturday's AFL Grand Final, with the Cats winger not taking part in his side's captain's run on Friday.

The young midfielder suffered a hamstring setback in last week's 71-point preliminary final win over Brisbane, with Holmes forced to be replaced by medical sub Mark O'Connor.

The 20-year-old has gained plenty of attention in the days leading up to Saturday's season decider, but is still no certainty to play with less than 24 hours before the opening bounce.

Geelong senior coach Chris Scott revealed at Friday's Grand Final Parade a call on Holmes' selection was yet to be made.

"He's probably done what he's needed to do from a physical point of view," he said.

"We were hoping we'd be at the point now where we could absolutely say that he was playing. What we do know is that it's absolutely not a 'no'.

"We just need to make sure that we spend the requisite time over the next little bit working through whether he's absolutely right and whether that's the best thing for us. We haven't absolutely made that decision just yet."

Now, according to The Age, Holmes did not take part in the Cats' final session of the week, instead placed on the sidelines chatting to club staff.

GEELONG, AUSTRALIA - APRIL 30: Max Holmes of the Cats leaves the field injured during the 2022 AFL Round 07 match between the Geelong Cats and the Fremantle Dockers at GMHBA Stadium on April 30, 2022 in Geelong, Australia. (Photo by Dylan Burns/AFL Photos via Getty Images)

Geelong may be forced into an 11th-hour call on Holmes, with a private session potentially on the cards for the former first-round pick.

Fringe midfielders Brandan Parfitt and Sam Menegola join O'Connor in being considered as Holmes' potential replacement, with the latter tipped as the most likely to land a starting spot in Scott's side.

"There are three guys over the last couple of weeks in our squad that have been desperately unlucky," Scott said.

"Mark is one of them, Sam and Brandan are the others. There's another group of players beyond them.

"But if you had have asked me 12 weeks ago, I would've said those three guys were in our team for sure. I feel desperately for them. If Max doesn't come up, it'll be one of those guys who comes in."

Holmes hasn't been the only injury concern this week, with Sydney veteran Sam Reid battling a groin issue.

In a similar fashion to Holmes, Reid was limited to in his abilities during his side's final session, even holding talks with coaches John Longmire and Dean Cox.

The Swans have remained adamant of Reid's prospects of playing, while omitted forward Logan McDonald is on standby as an emergency.

Geelong and Sydney will confirm their finals teams and medical subs at 1:30pm (AEST) on Saturday.