The Sydney Swans have made one forced change ahead of a huge Semi Final clash with Geelong at GMHBA Stadium on Saturday.

Sofia Hurley comes out of the side, after she experienced shin soreness following returning to play last weekend. Further imaging confirmed early development of bone stress, ruling her out for the remainder of the season.

Speaking to Sydney Swans Media, O'Riordan said Hurley's long-term health was the Club's priority.

"Sof did everything she could to get back and obviously had a pretty nasty injury the Giants, but unfortunately developed some early stages of bone stress," O'Riordan said.

"She ticked all the right boxes in her return to play protocol, medical team did an unbelievable job, did all the scans, did everything that was necessary, but as we always do here, the long-term health of the athlete is most important and that was no different for Sof. 

"Obviously she's a really good player, but we look at the long-term health more so and unfortunately this week  and for the rest of the season, just wasn't right for Sof."

Midfielder Molly Thomas comes into the side, after impressing in her debut season.

"Molly gets her chance this week to play in the semi-final against Geelong and she's earned every bit of that," O'Riordan said.

"Molly's a contested player, she puts her head over the footy. We love what she's done in her first year of footy and we're hoping that she can do the same on Saturday."

Geelong come into the match off a narrow four-point loss to Melbourne last week. O'Riordan expecting the Cats to bounce back, said he was expecting a tough contest. 

"They wouldn't have been happy with how they went down against the Demons," O'Riordan said.

"We're expecting them to bounce back, they're going to be pretty hungry, it'd be silly of us not to think they will be.

"So we've prepared accordingly for Geelong like we have for every team and we've no doubt they're going to bounce back. So if we bring our game, our pressure game, hopefully it's a good contest in Geelong."