Jockey Glen Boss is convinced Voleuse De Coeurs can be a serious contender against the big names in the Group One BMW at Rosehill.

Fiorente, It's A Dundeel and their Ranvet Stakes conqueror Silent Achiever head the line-up for Saturday's $1.5 million BMW (2400m).

The Mike Moroney-trained Voleuse De Coeurs worked over 1200 metres between races at Moonee Valley on Saturday and was pushed out strongly over the final 600 metres.

The imported mare has not raced since finishing fifth in the Group One Australian Cup on March 8.

However, Boss said the work convinced him the five-year-old would prove hard to beat in her next assignment.

"She's holding her condition well and she's in a good space," Boss said.

"She'll certainly be a top three chance I reckon."

Formerly trained by Dermot Weld to win the Irish St Leger, Voleuse De Coeurs was bought late last year in a deal brokered by Moroney's brother Paul and ran 10th in the Melbourne Cup at her only other start in Australia.

The suspended Boss was a keen observer of Saturday's Rosehill Guineas meeting which was run on rain-affected ground.

The jockey said similar conditions would favour Voleuse De Coeurs in the BMW.

"As long as she gets a proper soft track, she'll give them a shake next week," Boss said.

"She's just got a much better action on soft ground."

Boss has won the BMW twice, riding Makybe Diva in 2005 and Eremein the following year.

Three-year-old Savvy Nature, fourth in the Rosehill Guineas, is set to back up in the BMW.

Managing owner Max Whitby is keen to see Savvy Nature step up in distance for his next start.

"As long as he does well over the next few days, we'd like to have a go," Whitby said.

"He's a bit gross still and I would like to run in the BMW and then maybe come back to 2000 metres for the Queen Elizabeth."

Whitby said he would discuss all the options with John O'Shea when the trainer returned from the Dubai World Cup meeting.