Esteemed referee Joe Cortez said Conor McGregor and Paulie Malignaggi had to be called to order in a sparring session.

Former heavyweight champion Tyson Fury backed Conor McGregor to knock out Floyd Mayweather Jr inside 35 seconds in their blockbuster bout.

UFC star McGregor will step away from the octagon and into the ring to face unbeaten boxer Mayweather in Las Vegas on August 26.

Mayweather is coming out of retirement in search of a 50th win from as many professional fights and is an overwhelming favourite but Fury believes McGregor will stop the 40-year-old American in emphatic fashion.

"I think McGregor will knock him out inside the first 35 seconds like he did to Jose Aldo, to be honest," Fury told IFL TV. "I think McGregor will do him in one round.

"Come on McGregor!

"It would be good for boxing if McGregor chinned him. It would be great for the real people of the world."

Much has been made of the cross-combat fight but Fury joked: "I am going to call out Hulk Hogan next.

"We are going to get a fight on - me and the old Hulk.

"Hulk Hogan - I am going to get him out there and we are going to have a big pay-per-view fight."