The Crows are unsure how long Taylor Walker will be sidelined by a knee injury.

Walker, subbed off at half-time on Sunday, has a low-grade strain of his right knee’s posterior cruciate ligament.

He will not play this week and will have scans but the time required in rehabilitation will not be clearer for a few days.

Bernie Vince pulled up well from his first SANFL game since straining a hamstring while Tony Armstrong (hip) also returned with North Adelaide, Daniel Talia (Achilles) played a full game with South Adelaide’s reserves and 2010 draftee Jarryd Lyons (hamstring) returned with Glenelg’s reserves.

Wingman David Mackay is the next senior list player due back, with another three weeks left of a three-month rehabilitation from shoulder surgery.

Rookie Ian Callinan (bicep) will need another more week of full training before being released to play in the SANFL.

The Crows have a recovery and skills session on Tuesday from 9.30am. Four different groups will train on Wednesday from 8.45am and then the closed main football session is on Thursday. The team also will have a light run on Saturday from 9.30am on Max Basheer Reserve.