LUCKLESS Sydney Swans rookie Lloyd Perris has undergone a third knee reconstruction inside two years after innocuously rupturing his "good" knee at training last week.

The 20-year-old, who is yet to make his debut, has endured a torrid introduction to AFL football after needing two traditional reconstructions on his left knee and on Monday underwent the controversial LARS procedure on his right knee.

"He's had a wretched run since he started his career at the Swans and as a result his season has finished," Swans football manager Tom Harley said on the club's website.

"It was just one of those training mishaps and was Lloyd's good knee. He's had some ACL reconstructions on his other knee so it's devastating for him."

Perris managed five NEAFL games this season after enduring a number of setbacks since his last reconstruction midway through last season.

The midfielder was a member of the Swans Academy for three years and captained the NSW/ACT Rams before being recruited with pick 55 in the 2013 NAB AFL rookie draft.

Perris joins 2012 premiership defender Alex Johnson as current Swans to have had three knee reconstructions.

In better news for the fourth-placed Swans, Lance Franklin headlines a quartet of stars in line to return from injury for Sunday's clash with St Kilda at Etihad Stadium.

Franklin, who hasn't played since the round 18 win over Adelaide due to a back complaint, has trained strongly this week and just needs to complete the Swans' final training session on Friday to prove his fitness.

Gary Rohan (knee), Ben McGlynn (hamstring) and Tom Mitchell (eye) will also need to pass fitness tests to face the Saints.

"All four are really important and hopefully they get over the final hurdle at the back end of the week," said Harley

"It was good to see Lance running around and doing the full session and we'll do that again on Friday."