Dan Curtin will undergo surgery that will sideline him until at least round seven, after suffering a knee injury during a pre-season session.
"We are thankful Dan has avoided any bone or ligament damage in the dislocation," Crows high performance boss Ian McKeown said.
"However, Dan has had several partial dislocations previously, dating back to his junior basketball days.
"Given this, it's been determined the best course of action is to undertake a procedure which will provide more support and stability around the patella."