St Kilda will be without one of its most physical players against Brisbane in Friday night's AFL qualifying final at the Gabba, after forward Aaron Hamill was ruled out because of a knee injury.

Newly-crowned Coleman Medallist Fraser Gehrig also spent plenty of time stretching his left thigh during training on Tuesday and he left the track before his team-mates.

But a club spokesperson insisted the full-forward would be right for Friday night.

"He's fine, he did most of the session," she said.

Hamill jarred his left knee on the hard Telstra Dome surface last Saturday night against Fremantle.

The Saints learned on Monday night he had suffered a slight strain of the posterior cruciate ligament.

The 27-year-old could barely walk at training and his absence is a massive blow to the Saints, who need to turn around a 45-point loss to the Lions a fortnight ago if they are to position themselves for a genuine shot at the premiership.

Hamill, who has been plagued by knee troubles all season, is hopeful of playing in the Saints' next final even if they lose on Friday night and have to play the following weekend.

The former skipper, the Saints' equal-most experienced campaigner in September with eight finals to his name, was disappointed at not being able to play alongside his younger teammates.

"We've been through a fair bit as a group and a lot of the younger guys ... you certainly remember your first finals experience and not to be out there with them and with the boys, it's certainly going to be hard to take," he said.

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