AFLW Adelaide Crows co-captain Chelsea Randall will miss the 2020 season after tearing her ACL at the club's opening day of pre-season training on Monday.

Scans on Tuesday confirmed the worst for the 28-year old, who will likely have surgery in the coming days.

She becomes the fourth Crow to rupture her ACL in recent times, with fellow co-captain Erin Phillips, youngster Chloe Scheer and ruck Rhiannon Metcalfe all rehabbing from the injury.

The Crows are hopeful that the they will regain the trio for 2020 but it is currently too early to forecast.

Adelaide general manager of football administration Phil Harper said the club would support Randall through this tough time.

โ€œWe are shattered for Chelsea, sheโ€™s obviously been our captain and an integral part of our Club since the Womenโ€™s team was established in 2016,โ€ Harper told afc.com.au.

โ€œWe will make sure Chelsea has the best medical and rehabilitation support available so that she can be fit for the 2021 AFLW season.

โ€œWe all know how tough and courageous Chelsea is, so we know she will get through this and will still play an important part in our 2020 AFLW season.โ€