YOUNG gun Patrick Dangerfield has joined the list of Crows in rehabilitation after injuring his knee at training.

Dangerfield, 19, is nursing a minor medial strain and won't return to a full workload for up to three weeks.

Adelaide's other summer casualties have included Brad Moran (knee) and Brad Symes (knee), who both needed arthroscopic surgery, and Andy Otten (torn anterior cruciate ligament).

An NAB AFL Rising Star nominee, Dangerfield had not missed a pre-season session when he sustained the injury on Monday.

Physical performance manager Stephen Schwerdt said it was just a minor hiccup.

"Patty was in a marking contest and he just gave his medial a bit of a tweak. It's down the lower end of the scale, so it will probably keep him out at least a week," Schwerdt told afl.com.au.

"It's a little bit open-ended, but we don't think it will be a long-term injury.

"It's the nature of our training. If you're going to do competitive-type training there's always the risk of this sort of thing happening.

"But Patty hadn't missed any training prior to the injury, so he's got a bit of training in the bank."

The news was better for centre half-back Nathan Bock, who completed most of Thursday's three-hour session in his recovery from a fractured heel.

Midfielder Nathan van Berlo (back) trained mostly by himself and will be eased into a full program over the coming weeks.

Elevated rookie Brodie Martin is also increasing his workload, five months after rupturing his anterior cruciate ligament.

Martin, 21, ran laps around Max Basheer Reserve and looked comfortable kicking the football with teammates.