Rejuvenated New Zealand stayer Sangster needs a prominent Ranvet Stakes finish to extend his return to Australian racing beyond Saturday's $400,000 weight-for-age race at Rosehill.

Winner of the Auckland Cup at his most recent start, Sangster will be flown to Sydney on Thursday with the explicit goal of earning enough prize money to contribute to a late entry fee for the $2.25 million BMW at Rosehill on April 6.

"If he runs well enough ... in the first three or four, we'll pay the late nom for the BMW and head there," trainer Trent Busuttin said.

The BMW late entry fee is $60,000 but such is the healthy breakdown of the purse, horses finishing sixth to 10th in the 2400m staying test receive $50,000.

"You are a good chance of getting your money if you pay the late entry," Busuttin said.

Sangster will arrive in Sydney in much better form than when he was here for the 2012 Australian Derby.

"He didn't come up for whatever reason in the autumn last year," Busuttin said.

"His form didn't warrant going to Melbourne in the spring so we decided to give him a long break and he's obviously come back very well from it."

With the three-year-old Fiveandahalfstar confirmed for Saturday, the past two Victoria Derby winners will take their place in the Ranvet, inclusions which Busuttin says should silence the spring Classic's knockers.

"I got sick of 10,000 people telling me the Victoria Derby ruined my horse," he said.

"My horse has won a couple of Group Ones since and the fact the horses who finished one-two last year came out and quinellaed the Australian Cup sort of puts that myth to bed a bit."

Since his return to racing in mid-December, Sangster has collected Group One wins in the International Stakes and Auckland Cup either side of a Group Two success.

His jockey in each of those wins, champion rider Opie Bosson, will retain the mount in a decision Busuttin said had no cause for debate.

"He knows the horse, he's ridden in Australia with success and he's an international rider," Busuttin said.