Sydney will go to the tribunal in a bid to have defender Tom McCartin available for their AFL elimination final.
McCartin has a two-game rough conduct ban for his high bump on Adelaide's Shane McAdam during the frenetic final quarter last Saturday night at Adelaide Oval.
The suspension sidelines McCartin for their round-24 game this Sunday against Melbourne at the SCG and their elimination final, with Sydney now guaranteed a top-eight berth.
But Swans coach John Longmire said on Monday they feel the clash with McAdam was accidental.
"We've decided to challenge it because we feel it was an accidental football incident," Longmire said.
"The ball deviated. Tom didn't brace let alone elect to bump.
"Because of the ball and which way it bounced Tom didn't have a lot of choice. We'd like him to be available this week, but once again the appeal is based upon the incident."
Collingwood forward Beau McCreery also faces a one-game ban for a dangerous tackle.