Key forwards Aaron Hamill and Alastair Lynch remain the biggest injury concerns this September ahead of the AFL preliminary finals.

St Kilda's Hamill and Brisbane's Lynch are yet to play in the finals and will try to prove their fitness over the next few days.

Hamill is rated a 50-50 chance because of the knee injury, a strained posterior cruciate ligament, he suffered in the round-22 win over Fremantle.

His availability will be determined at Tuesday's training ahead of the Friday night preliminary final against Port Adelaide at AAMI Stadium.

Lynch also injured his hamstring the week before the finals, but is the more likely of the two big men to return.

He was completing sprint drills at three-quarter pace on Friday.

Brisbane key defender Darryl White (illness) and its "Mr September" ruckman Clark Keating (illness, calf) were late withdrawals from the qualifying-final demolition of the Saints.

The pair is expected to be fit for Saturday night's preliminary final against Geelong at the MCG.

St Kilda utility Heath Black (illness) should also be available for the trip west.

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