Group one winning jockeys Michelle Payne and Michael Walker have been called to front stewards over alleged betting activities along with fellow rider Anthony Darmanin.
The inquiries will be held in Melbourne tomorrow after a lengthy investigation by Victorian stewards, following a routine audit of wagering service providers' betting accounts.
The three will be questioned over bets placed on local and international thoroughbred races. None of the jockeys rode in the races in question.
Payne, who recently came back to riding from a serious injury, will be questioned over three bets totalling $450 through a Sportsbet account in her name.
Walker will be quizzed over four bets totalling $57 placed via a Tattsbett account in his name while bets amounting to $100 were placed in a Sportsbet account bearing Darmanin's name.
