Racing Victoria has introduced a rule making it an offence for licensed people to bet with unapproved wagering operators.

The rule, which comes into effect on September 1, applies to all licensed and registered persons, including trainers, stable employees, bookmakers, farriers as well as registered owners and industry officials.

There are 244 operators approved to wager on Victorian racing which includes international corporate organisations through to individual interstate bookmakers.

Dayle Brown, Racing Victoria's executive general manager - Integrity, said the non-approved operators pose a risk to punters and the industry.

He said they pay no returns and don't comply with integrity requirements as approved operators do.

"The level of complaints that Racing Victoria and other law enforcement authorities have received over recent months regarding non-approved wagering operators, particularly those based offshore, failing to pay punters monies owed has increased to a concerning level," Brown said.

Brown said the new rule minimises the risk of participants losing money to non-approved operators.

The new rule also allows for stewards to direct a person they believe to have wagered with a non-approved provider to produce all relevant documents and devices along with username, password or other security information.