Trainer Chris Waller will launch a triple attack on the Tattersall's Tiara with last year's winner Red Tracer, her heir apparent Catkins and She's Clean.

The 1400m event for fillies and mares at Eagle Farm on Saturday is the final Group One race of the Australian season.

For some of the runners, including perhaps Red Tracer, it is also the final race of their careers.

With the breeding season looming, owners are contemplating matings and as a dual Group One winner and multiple placegetter at the highest level, six-year-old Red Tracer has little to prove on the track.

"I don't know if this will be her last start or not. It could be," Waller said.

Before last year's Myer Classic, the trainer lauded Catkins as the next Red Tracer and she proved him right when she was beaten just a short half head by her stablemate in the Group One race.

The four-year-old won three Group races during the Sydney autumn and ran third to Steps In Time in the Group One Coolmore Classic.

She threw a scare into the camp when she hurt herself in her box before the Danehill Stakes at Eagle Farm on June 7.

But Waller said it was only a minor hiccup and he was confident she would be spot-on for the Tatt's Tiara.

"She will be fine," he said.

"She banged a leg and had to be treated for it.

"She galloped last Wednesday and again on Saturday and the reports are all good."

Like Catkins, She's Clean is owned by the Ingham family. She has won two stakes races and finished fifth, beaten less than three lengths, in last year's Tatt's Tiara at her only Group One appearance so far.

Steps In Time will head to the breeding barn after the Tatt's Tiara with trainer Joe Pride giving her the go-ahead for one last race after she sparkled in a barrier trial win on Friday.