Adelaide ruckman Sam Jacobs will miss the Crows' clash with Gold Coast this weekend, as he sits out his third straight match with a knee problem.

Jacobs last played in the Crows' win over Sydney in round two, but has since sat out after picking up a collision injury to his right knee.

โ€œSamโ€™s knee had shown encouraging signs of improvement over the last two weeks,โ€ Adelaide's Science and Medical Services Coordinator Steve Saunders told afc.com.au.

โ€œUnfortunately, Sam is still presenting with meniscal symptoms that have prevented multi-directional and dynamic training progressions despite other improvements in function.

โ€œIt is a complex meniscal problem with acute and longstanding or chronic pathologies involved.

โ€œSam will be re-evaluated by club specialists over the next 48 hours and we will provide updates as to his management plan as the Clubโ€™s medical team works through all options available.โ€

A timeframe for Jacobs' return remains unknown.