THE punter involved in the explosive Racing Victoria stewards inquiry into jockey Danny Nikolic's riding is set to be banned from Australian racecourses.

Former bookmaker Neville Clements, along with fellow punters Alessandro Alaimo and Kevin McFarland, will be asked by Queensland Racing stewards to show cause why they should not be warned off Queensland racetracks.

Due to agreements between state and territory racing authorities, a person warned off in one jurisdiction is automatically banned from tracks nationally. Racing Victoria stewards yesterday continued their inquiry with Nikolic, who has admitted using Clements as a form student. Nikolic was grilled for 45 minutes behind closed doors at Sandown as data and phone contacts taken from his mobile phone were analysed.

QR stewards yesterday resumed their inquiry into the defeat of $1.30 favourite Baby Boom at the Sunshine Coast on January 3. The horse is trained by Nikolic's brother, John. It has been reported as much as $300,000 was invested on Baby Boom on Betfair. The mare finished fourth. John Nikolic has since handed in his trainer's licence.

Nikolic and Baby Boom's jockey, John Keating, appeared before QR stewards yesterday. Stewards said later that Nikolic ''confirmed his long-standing relationship with Alaimo'' and admitted contacting him on the morning of the race. But Nikolic denied offering any information in respect to the winning chances of Baby Boom.

Nikolic also confirmed he has an association with Clements and provided evidence that McFarland is a friend of Alaimo.

Alaimo, McFarland and Clements refused to supply phone and betting records to QR stewards.

Keating told stewards he had met Alaimo but denied an association with him.

Because of their failure to co-operate with the inquiry, Queensland Racing has issued the three punters with a notice to show cause why they should not be warned off Queensland racecourses.

Stewards are considering the evidence given by John Nikolic and Keating.