Key Adelaide defender Nathan Bock is a chance to return from a groin injury for Saturday's AFL game against West Coast.

Bock, who has missed the past two matches, will have a fitness test later this week to determine his availability for the Subiaco Oval fixture.

Adelaide seem certain to lose ruckman Jon Griffin to an ankle injury sustained in their win over Essendon last Saturday night.

And rookie Matthew Jaensch is also uncertain to make the trip to Perth after suffering a head knock during the victory over the Bombers.

But long-term absentees Chris Knights and Brett Burton are close to resuming in the SANFL.

Knights hasn't played since round five due to a foot injury while Burton has been sidelined since round eight after undergoing knee surgery.

Both will also be tested at training later this week, the Crows said on Monday.

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