The backman sustained the injury shortly before half-time in Saturday's agonising one-point loss to Sydney at Docklands, but played out the game.
But he has since had surgery to have a plate and screw inserted.
The Roos have lost another defensive stalwart Michael Firrito to suspension.
With fellow defender Nathan Grima already out with a finger injury, it leaves the club's defence badly depleted for Sunday's clash with Adelaide.
-AAP
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