PERTH, AUSTRALIA - APRIL 13: Aliir Aliir of the Swans breaks clear of Sam Mitchell of the Eagles during the round four AFL match between the West Coast Eagles and the Sydney Swans at Domain Stadium on April 13, 2017 in Perth, Australia. (Photo by Paul Kane/Getty Images)

The Swans have made a late change ahead of their clash with Brisbane at the SCG this afternoon.

Young defender Aliir Aliir has been withdrawn from the side after missing a training session yesterday.

He has been replaced by Harrison Marsh.

"It is disappointing and unfortunate that Aliir comes out of the side and Harry Marsh comes in," Sydney's Head of Football Tom Harley said.

"We had a training session yesterday and it is disappointing that Aliir didn't attend and we can't stand for that as a football club so he has taken full responsibility for that."

"We move on with the game and Harry Marsh comes in as his replacement."

Brisbane will go into the game as selected.

FULL ROUND 7 TEAM LINE-UPS