Former UFC champion Vitor Belfort, 44-years-old, has continued to call for a boxing showdown with social media star Jake Paul (4-0, 3 KOs).

Belfort returned to a boxing ring last Saturday in Florida, and he picked up a first round stoppage over former undisputed heavyweight champion Evander Holyfield.

The contest was mobbed with controversy, because most observers felt a 58-year-old Holyfield, who was out of the ring for over a decade, should never have been approved for the fight.

Belfort connected with an uppercut to drop Holyfield - and then a moment later he finished the fight with a barrage of punches to force a stoppage by the referee.

Their fight headlined a pay-per-view event that was being staged by the Triller app. 

Following that win, Belfort called for a fight with Paul.

Executives from Triller are offering $30 million to Paul, to face Belfort on a date in November.

"I'd like to teach that boy a lesson. Your parents give you behaviors and all that, so he's gonna meet his big daddy," Belfort said to TMZ Sports.

"And, if he likes money, we got big money. There's no excuse to run away from this fight. So, he has to take it, and if you don't take it, he's gonna show he's a coward and he's looking for easy fights. I'm gonna knock [Jake Paul] out. There's no doubt about it.

"I think it's worth it. $30 million to get your ass whooped by a legend like myself."

However, the fight is unlikely - because Paul recently signed an exclusive multi-fight contract with Showtime.

Last month, Paul headlined a Showtime pay-per-view event - and picked up an eight round split decision win over former UFC champion Tyron Woodley.

At the moment, the frontrunner to face Paul is unbeaten light heavyweight Tommy Fury (7-0, 4 KOs), the younger brother of WBC heavyweight champion Tyson Fury.