“Whether or not the injury requires surgery will be determined in the coming days after speaking with relevant experts.
“All teams face injuries to key players and we now have to find a way without Paddy.
“Part of the motivation for our group now is to make sure we don’t let him down and instead step up.”
The Saints could also be without Jake Carlisle for the rest of the season as the defender weighs up whether to leave the AFL bubble to be with his expectant partner.
St Kilda will also learn on Sunday whether backman Ben Long is offered a suspension for his high bump on Bulldog Jack Macrae.