Sydney defender Callum Mills was assessed for a right knee concern on Saturday against Brisbane at the SCG.
Mills was assisted from the ground by staff after attempting to change direction.
Sydney confirmed a knee injury throughout the game for Mills, he required the use of crutches after returning to the bench.
Mills has undergone further assessment to determine the severity of the injury, he has a confirmed ruptured ACL.
He will undergo surgery and is expected to miss approximately 12 months.
Mills averaged 23.1 disposals, 5.0 marks and 2.5 tackles in 2026.
AFLRATINGS Fantasy Impact: The Swans will require a replacement next week across half back for Mills who suffered a serious knee injury.
