Tania Hyett, the partner of suspended jockey Danny Nikolic, is being investigated over wagering significant amounts of money on horses to lose with Australia’s major betting exchange BetFair.

Hyett, who has already been interviewed by Racing Victoria stewards, is expected to be called again to give evidence in the next few weeks.

A registered stablehand employed by Aquanita Racing at the time, she was not permitted under the rules to lay horses from her stable to lose.