But Victoria Police is convinced the decision "doesn't open the floodgates", and will speak with Attorney-General Martin Pakula should they need to harden exclusion order laws.

Those banned include Mick Gatto, Tony Mokbel and his brother Horty, former Carl Williams associate Rocco Arico and former bikie boss Toby Mitchell.

Antonio Madafferi, an alleged senior Melbourne figure in Calabrian mafia, has filed a Supreme Court writ in relation to his ban, but a hearing date is yet to be set.

He is suspected to fight the order on similar grounds as Mr Nikolic, as he has never been charged with a criminal offence. He denies any involvement with the mafia.

Mr Nikolic had his ban quashed on Thursday after the Supreme Court agreed he was denied procedural fairness when Deputy Commissioner Shane Patton refused to give him access to secret information that underpinned the order.

Deputy Commissioner Patton said the force would not compromise when it came to protecting the integrity of this protected information, which included material gleaned from informers, and information about current investigations.

Victoria Police would not comment on the number of people hit with exclusion orders, but confirmed to Fairfax Media in May last year that 55 people had been banned.

Deputy Commissioner Patton said those banned in relation to their extensive criminal records, and not because of intelligence that suggested they were involved in crimes they had not been charged for, would be unable to challenge their bans on the same grounds as Mr Nikolic.

"Many of them would have been banned on their significant criminal history, they're aware of what their criminal history is, those type of matters are very straightforward," he said.

"It's where we have those matters where intelligence has been provided by other agencies, when we have human source material, where we have police methodology that we need to explore on what basis a decision was made.

"We don't make these decisions lightly. The reason we have excluded these people in the first place is because we believe it's in the public interest to do so, and because of risk."

Deputy Commissioner Patton said the force would have to review the decision before deciding on an appeal.

Mr Nikolic will take his fight to the Victorian and Civil Administrative Tribunal on Friday, hoping to overturn a separate riding ban imposed by Racing Victoria.

The 2003 Caulfield Cup-winning jockey needed to overturn the police ban, imposed in November, to give him any chance of resuming his riding career.

On Thursday morning, Justice Tim Ginnane ruled that Deputy Commissioner Patton had no legal right to ban Mr Nikolic, 41, from racing.

"The exclusion order was not made in accordance with law, in that Mr Nikolic was not provided with details of adverse allegations against him."

He said that as Mr Nikolic was not provided with specific details of the allegations against him, he had the right to defend himself.

Deputy Commissioner Patton wrote in his November decision that Mr Nikolic had "a limited appreciation of, or ability to control, your behaviour towards others, including racing officials and participants, family members, associates and the general public.

"The protected information that I considered also demonstrated matters relevant to your lack of integrity, criminal associations and poor character."

On Thursday, Ron Merkel, QC, for Mr Nikolic, asked the court to impose an order to "quash" the racing ban. Justice Ginnane said he intended to make an order "to that effect".

Outside court, Mr Nikolic's lawyer Pat Lennon said the decision was a relief.

"From Dan's perspective, it validates him," he said.

Racing Victoria banned Mr Nikolic from riding for three years until September 2015 for threatening Mr Bailey at the Seymour races in September 2012 and for threatening steward Wade Hadley at a VCAT hearing.

Racing Victoria subsequently rejected Mr Nikolic's application for a jockey's licence, ruling he was not a fit and proper person to ride in races.

with Patrick Bartley, Mark Russell