Sam Switkowski has a stress fracture in his back and will not be available for selection when Fremantle’s season resumes in round 15.
Executive general manager of football Peter Bell said Switkowski had a similar injury in 2020.
“Sam will require a period of non-running followed by a repeat scan before being cleared to progress in his return to training,” Bell said.
“It is not possible to ascertain an exact time frame with this type of injury.
“It is disappointing that we will be without Sam for a period of time, as he is an integral part of our team and one of our best trademark players.
“We also know that Sam will attack his reconditioning with the same professionalism and purpose that he has demonstrated in all aspects of his career.”