Jeff Horn's promoter says the decision by Terence Crawford's camp to ban Australian media is a perfect example of why the pound-for-pound sensation is barely known outside of the boxing world.

Duco Events boss Dean Lonergan reckons the unbeaten former unified champion should seek new management after his co-manager/trainer, Brian McIntyre, allegedly told travelling Australian media they would not be allowed to speak to Crawford because they would "twist our words".

While Saturday morning's world title fight in Las Vegas is enormous for Australian boxing, the build-up in the US has been tame - and Lonergan fully blames Crawford and McIntyre for the scenario.

Lonergan says the entire situation has been created based on advice that Crawford was receiving from his management.

"I think Terence Crawford would be the worst-managed, worst-advised fighter in the history of boxing," Lonergan told reporters.

"We're in Las Vegas, on the strip there are thousands of entertainment choices - restaurants, theatre shows, concerts.

"The only way we're going to get people out of the restaurants and into the arena is to talk to the media in a big way and make the fight interesting.

"The more you talk to the media, the more brand equity you'll build in your fighter, the more money your fighter can make.

"Terence Crawford is nowhere near the global titan superstar he should be.

"Rather than making dominate-the-world type money, he's making BoMac money. That's the money you get which is 10 per cent of what you should be getting paid."

Lonergan said Crawford, 30, should engage Horn's trainer Glenn Rushton if he wanted to "enjoy" his career.

"Because at the moment, I guess you're not mate, because you're not doing the fundamentals of the sport," he said.

"Terence Crawford has got a lot of good stuff going for him.

"He's a fantastic fighter and he looks like he's a wonderful father, but through bad advice from Brian McIntyre, he's not saying what he should be saying."

Crawford is the raging hot favourite to become the new WBO welterweight championship but Lonergan said another famous Horn upset was brewing.

"There is no-one in the American media who thinks Jeff Horn has a chance, and they are so wrong. This is a two-horse race," he said.