SYDNEY Swans ruckman Mark Seaby has been ruled out for the rest of the season.

Club physiotherapist Matt Cameron told sydneyswans.com.au that Seaby would need to have surgery next week to remove bone spurs on his ankle.

Former Eagle Seaby, who joined the Swans this season, broke his left ankle in the opening minute of the round six match against the Brisbane Lions and was expected to miss up to 12 weeks following surgery to repair the fracture.

But his progress has now been halted by the ankle problem.

"The fracture healed well," Cameron said.

"This is related to a pre-existing condition in Mark’s ankle and he’ll have an operation next week to remove bone spurs from the ankle joint."