Geelong is set for a massive boost before the finals with Gary Ablett and captain Joel Selwood set to be named for Sunday's clash against Sydney.

Speaking to the media on Tuesday, Cats assistant coach Matthew Knights said Ablett looked good in his first full training session with the team since leaving the Cats' bubble after their loss to Collingwood in Round 7 due to personal reasons.

Ablett was given a rousing reception from his teammates when he first stepped on the field at Southport, with him leaving the AFL quarantine hub Tuesday morning after serving his mandatory 14 day quarantine, per The Herald Sun. 

"All indications look pretty good at this stage. He trained really well. He got through the session unscathed and moved really well," Knights said.

Selwood has been missing from the Cats' lineup since Round 12, and after completing training on Tuesday, Knights confirmed the Geelong captain will be a 'certain starter'.

Ruckman Rhys Stanley did not train on Tuesday but Knights stated that did not rule him out for selection this weekend.

Meanwhile, St Kilda are pressing to make their first finals appearance in nine years with midfielder Zak Jones sitting on the sidelines, according to The Age. 

The Saints sprinter has revealed he has minor strains after hurting his hamstring in the club's loss against West Coast last Thursday.

Jones is set to miss the Friday night frenzy against Greater Western Sydney, which will decide the Saints fate for this finals season.

If the Saints manage a win they will secure their spot in the finals, but a loss will have them relying on overall game results for the week.

"Zak has become an important part of our midfield this year but we know that all teams are dealing with injuries to key players and we will need someone to step up and fill the void," St Kilda chief operating officer Simon Lethlean said.

"We will weigh up the best option to replace Zak and trust whoever does come in to do the job."

Fellow Saint Dan Hannebery has been pushing for a spot against the Giants after his own hamstring injury has had him on the sidelines for 12 weeks.