Controversial businessman and punter Eddie Hayson will be unable to bet for the next six months after being warned off racetracks for refusing to name names in the More Joyous affair.

Hayson told the high-profile inquiry in May he had decided not to back More Joyous in the All Aged Stakes after receiving information from two people, one of whom had a connection to the Gai Waterhouse stable.

Racing NSW asked Hayson to disclose the names of those people and called him to a show cause hearing last week to give him further opportunity to do so.

On Tuesday the governing body issued a warning-off notice which precludes Hayson from attending race meetings or placing a bet with any wagering company.

John Singleton, owner of More Joyous, sparked the inquiry when he publicly sacked Waterhouse as his trainer after the mare finished unplaced in the All Aged Stakes on April 28.

A statement from Racing NSW said Hayson's refusal to disclose the names had hindered the stewards' investigation.

Racing NSW chief executive Peter V'Landys said integrity in racing was paramount.

"Accordingly, no individual's interest should outweigh the confidence of the public, and particularly punters, in the integrity of the industry," V'Landys said.

"A particular line of inquiry that stewards wished to pursue couldn't proceed, because of the actions of Mr Hayson."

Singleton was fined $15,000 for improper conduct at the conclusion of the inquiry while Waterhouse is appealing fines for failing to report a condition that could have affected More Joyous in the All Aged Stakes and the Queen Of The Turf.

More Joyous has been retired and is now in England waiting to be served by champion racehorse Frankel.