St Kilda forward Tim Membrey is facing at least a week out of action after suffering a head knock in Sunday's clash with the Crows.

Membrey was moving back with the flight of the ball in a marking contest before falling to the ground, with the back of the 28-year-old's head slamming into the Adelaide Oval surface.

The Saints attacker remained on the turf for some time before being helped to his feet by club medical staff, with Membrey in an unsteady and dazed state as he slowly made his way from the ground in the arms of medicos.

It was soon after that St Kilda made their tactical sub change, with midfielder Jack Bytel brought into the game late into the third quarter of the match.

A failed head injury assessment will automatically mean Membrey will be sidelined for the following 12 days under the AFL's concussion protocols, forcing the forward to spend more time in the club's casualty ward.

Membrey missed the opening five rounds of the season after requiring minor knee surgery in the pre-season, with his return a welcomed one for Ross Lyon amid an ongoing injury crisis at Moorabbin.

While Membrey is now expected to miss the Saints' Round 10 clash with GWS, Lyon is likely to regain key forward Max King for his first game of the year following shoulder surgery from late last year.

Membrey wasn't alone in sustaining an injury, with a knee complaint ending skipper Jack Steele's afternoon.

The Saints confirmed a precautionary measure was taken to remove Steele from the remaining moments of the game in the final quarter.

His midfielder counterpart in Rory Laird was also subbed out in the last stanza after copping a knock to the ribs in the dying stages, with Ned McHenry coming into the match with just over half a quarter to go.

The injury looks unlikely to limit Laird's chances of facing the Western Bulldogs next week in Ballarat.

Adelaide WON BY 52 POINTS
Adelaide Oval