Racing authorities are investigating the controversial BC3 Thoroughbreds but say they have no jurisdiction over a punters' club operated by Bill Vlahos, chairman of the syndication company.

Vlahos, who appeared in the NSW Supreme Court last week over money missing from the punters' club, was reportedly assaulted at his Connewarre property in country Victoria on Sunday night.

Victoria Police confirmed a man had been assaulted and a car set alight at the property.

Racing Victoria chief executive Bernard Saundry said RV's integrity department was looking into the company which removed its list of personnel from its website on Monday.

"As the lead regulator for syndication in this state, Racing Victoria stewards are investigating BC3 Thoroughbreds and the conduct of its racehorse ownership business," Saundry said.

"Racing Victoria has regulatory control over the conduct of thoroughbred racing in this state, however it does not have regulatory control over punters' clubs or wagering schemes.

"Such clubs or schemes fall within the jurisdiction of the ACCC, Consumer Affairs Victoria and the Victoria Police and I strongly encourage any investors with grievances to contact these parties."

Saundry said RV was also concerned with reports of the assault at Connewarre.

"In light of this incident we have been liaising with BC3 Thoroughbreds today regarding the welfare of their horses and staff which remains of importance to Racing Victoria," Saundry said.

Vlahos told the court hearing there was $194 million in a Westpac account but the bank said no such account existed.

BC3 signed a $5 million contract to buy a half brother to Black Caviar at this year's Easter Sale.

The colt has spent the past few weeks in the Werribee Veterinary Clinic being treated for the life-threatening hoof disease laminitis.

BC3 also has a full sister to the colt, Belle Couture, who won a jump-out at Flemington last week in preparation for a planned racetrack debut later this month.