Peter Moody flagged the possibility of a clash between Black Caviar and her half-brother All Too Hard in the All Aged Stakes.

Moody said he wouldn't be concerned if the pair did meet next month in Sydney along with More Joyous and Hay List, claiming it would be "great for racing".

However, the mare's managing owner Neil Werrett, who also has an interest in All Too Hard, has said he doesn't want the clash to happen.

Werrett told Fairfax Media that it would be "counter-productive" for the two to meet.

Moody fronted media on Wednesday ahead of Black Caviar's attempt at a 24th straight win in Friday night's Group One William Reid Stakes at Moonee Valley and believes the unbeaten champion is in as good a shape as she has ever been.

And asked about a potential All Aged Stakes start, the premier trainer said it was "certainly" an option.

"It's a terrific race, her record at 1400 metres is good, she's one for one, so most definitely (it's a possibility)," Moody told reporters.

"It's Group One at weight-for-age, everything sort of fits the criteria for her."

Black Caviar can join Kingston Town as a 14-time Group One winner on Friday night.

Her first Sydney target will be the T J Smith Stakes (1200m) should everything go to plan.

Moody said it was "not a concern" of his if Black Caviar did happen to run in the All Aged against All Too Hard.

"It would be great for racing," he said.

"You've got the likes of More Joyous and Hay List and probably numerous others. The next six weeks could throw up something else. It would be terrific for racing if that happened but we'll cross that bridge when we get to it."

Black Caviar is expected to attract 25,000 fans to Moonee Valley for what has been billed as the mare's likely last start in Victoria, but Moody reiterated that there was a possibility she could yet race on next season.

He believes she's going as good as she ever has, evidenced by a track record first-up win in the Lightning Stakes.

"If she came out and produced another two or three Lightning runs it would be hard to retire her, wouldn't it?" Moody said.