Leading jockey Danny Nikolic described allegations of him threatening Victoria's chief steward Terry Bailey as 'outrageous' during a hearing that saw his riding ban upheld by Racing Victoria's Racing Appeals and Disciplinary (RAD) board.

Nikolic was banned indefinitely on Tuesday by Bailey after an altercation between the pair in Seymour.

The 37-year-old jockey allegedly threatened and verbally abused Bailey prior to a race in Seymour, a dramatic hearing was told.

Nikolic fronted the RAD on Wednesday in an attempt to have his ban overturned so that he could ride seven-time Group One winner Mosheen at Flemington on Saturday, but RAD chairman Russell Lewis revealed the board had sided with the evidence of the chief steward.

The tribunal heard that the altercation began as Nikolic rode to the starting gates for a race at Seymour and allegedly called out to Bailey, saying: "Keep your eyes on the road, Terry."

Bailey reportedly questioned the jockey over the comment with Nikolic replying it was a line from a 'television advertisement' and meant as a joke.

Both parties acknowledged the matter escalated before the next race, where Bailey was to take his position in the steward's tower.

The hearing heard Nikolic then told Bailey: "We've all got families c*** and we know where yours lives, c***."

The jockey countered Bailey's allegations, labelling them 'outrageous', and saying he did not know where Bailey lived before the tribunal sided with the Victorian steward after a five-and-a-half hour hearing.

Nikolic claimed Bailey was the one to issue the threat: "I told you I would f*** your career."

He went on to say he had no idea why Bailey would make the claims, stating: "Family is the most important thing to me."

In a series of allegations, Nikolic said he had been told a race in Bendigo was being investigated over allegations it was fixed.

Asked about the allegations Nikolic said: "I'm not upset because I have done nothing wrong."

Evidence Nikolic had been questioned in relation to a murder were also heard amid reports Bailey had contact with the Purana Taskforce, which is investigating the murder of racing identity Les Samba - Nikolic's former father-in-law.