Sam Reid has also been ruled out for the season after tearing his hamstring against Fremantle on Saturday.

Longmire said that the dynamic 23-year-old had suffered a significant injury that will sideline him for over a month.

Reid has been in the best form of his season over the past month but now joins Franklin, co-captain Kieren Jack and midfielder Luke Parker on a star-studded injury list.

It will leave the Swans' attack undermanned with Kurt Tippett, Adam Goodes and Dean Towers likely to be Longmire's tall options up forward.

In better news, Nick Smith (hamstring) is a chance to return form injury to face the Kangaroos after missing the past two games, with the defender likely to train lightly on Tuesday, before attempting to rove his fitness at training on Thursday.

Parker (leg) and Jack (knee) are highly unlikely to play in Saturday night's semi-final.

"Luke Parker is walking past my office and doing cartwheels but he'd have to do a pretty good set of cartwheels for the rest of the week to be able to play, so we'll have to wait and see," Longmire said.

"We certainly won't risk him but he's actually coming along pretty well so that's a good sign."

News: Franklin to sit out 2015

The Swans might not be able to call on some of their biggest stars for their semi-final clash with North Melbourne at ANZ Stadium on Saturday night, but Longmire preferred to keep the focus on the players who will be fit to take on the Kangaroos.

"We know we've got some quality names out, you can't deny that, but when we put the names up on the match committee board we look at the players we've got rather than the ones that we haven't," Longmire said.

"We were pleased with a lot of the players that played on the weekend. We thought they really contributed but we need to go again this week.

"Whether they're experienced players or younger kids coming in and playing their first or second final, they need to perform well."