According to the NSW Police, Tommy Mercuri Junior is so dangerous and has such strong connections to an outlaw motorcycle club that his presence at a recent suburban boxing event would have put the public at immediate risk.

According to his father, he's a 15-year-old boy.

The bizarre situation occurred last week when an organiser for an amateur boxing night in Sydney's south-west received a notice from NSW Police telling him the teenager was not allowed to fight on his card.

"In 23 promotions, which would total at least 600 fighters, it's the first person I've ever had removed off the card," said Scott Symons, president of 2 Blues Boxing, the group which ran the night.

"To have a 15-year-old private school boy as my first actual person taken out is incredible."

Scott Symons said he is surprised a 15-year-old is the first boxer he's had removed from a card.

When Scott Symons contacted the police officer responsible for the ban he was even more astounded.

"He said, 'he has, his father has, outlaw motorcycle gang links'," Mr Symons said.

The ban was demoralising to Tommy — it was to be his first amateur bout after a year of training — and enraged his father, well-known Australian boxing trainer Tommy Mercuri Senior.

"I've never ever seen anybody not allowed in the ring — especially a 15-year-old boy — for being an associate or a criminal," Mercuri Senior told 7.30.

"I've seen people come out of jail and register … and walk in the ring and fight, you know, we're talking about a 15-year-old boy."

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Mercuri Senior had links with notorious crime figures

Mercuri Senior said he believes his son is being punished for the sins of his father.

Mercuri Snr has been twice convicted, once for assaulting a police officer and once for possession of unlicensed firearms.

Rebels boss Alex Vella has been stranded in Malta since June last year. ( ABC: Mark Willacy )

He is also friends with Mick Gatto, the notorious Melbourne underworld figure who had his Victorian boxing promoter's license cancelled several years ago due to his unsavoury reputation, and Alex Vella, the power behind Australia's largest outlaw motorcycle club the Rebels.

For almost half a century the Rebels have been synonymous with violence and the outlaw lifestyle.

Dozens of its members have been convicted of a variety of violent crimes up to and including murder.

Since 2012, police across the country have been cracking down on the club.

That crackdown extends to attempts to sever all Rebels ties with combat sport including boxing.

In the last three years, NSW Police have closed down dozens of Rebels clubhouses around the state, including the club's national headquarters in Sydney's south-west.

I just want to show everyone that I can box: Tommy

Mercuri Snr said he does not believe his son should have to pay for crimes his father committed.

"He's never done anything wrong to anyone, he's never committed a crime," he said.

"I think it's ludicrous, I think it's just stupidity that you [link a] kid to a motorcycle club."

"He's not even licensed to ride a motorcycle."

Two boxers at the Cabramatta Leagues Club, competing on the card Tommy Mercuri Jnr was going to fight on.

Neither the police nor the regulator, the NSW Combat Sports Authority, would agree to interviews for this story.

In a statement, the NSW Police said it conducts "risk assessments" in collaboration with the authority.

"Once the promoter of the fight night provides the details of the participants in the event, an assessment is carried out including probity checks," the statement said.

"As a result of the assessment police have the power to exclude participants."

As for Tommy, he said last weekend's exclusion won't stop him from pursuing his dream to represent Australia in boxing at the Olympics.

"I just want to show everyone that I can box and hopefully represent Australia one day," he told 7.30.