Tyson Fury urged UFC champion Francis Ngannoo to “watch the Gypsy King” and “earn some real money” in a boxing match.
Ngannou is now a free agent after defeating Cyril Gain in the final bout on his current UFC contract.
And Fury appears set to welcome Cameron’s star into the boxing ring for a fascinating crossover clash.
He tweeted: “Congratulations @francis_ngannou but if you want to earn some real money watch GK.”
The disparity in fighter pay was highlighted between the UFC’s Ngannou and unbeaten boxing champion Fury.
Nganou, 35, took off with £440,000 beating Gain, 31, but received a bonus when pay-per-view sales are counted.
While Furr, 33, earned £22m alone in October for his brutal 11-round knockout in his trilogy with 36-year-old Deontay Wilder.
YouTuber turned 5-0 award-winning Jake Paul – embroiled in a feud with UFC boss Dana White – got hit in the UFC 272 purge.
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Paul, 25, posted: “I can’t stress enough how bad this is..
“My next steps to help in this situation will be announced tomorrow. Pay the fighters more.”
UFC fighters are prohibited from competing outside the promotion unless a special exemption is granted.
Conor McGregor, 33, suffered a ten-round loss in 2017 against boxing legend Floyd Mayweather, 44.
No fighter has been given such permission, which is why Ngannou is considering exiting the UFC.
He has previously asked for a pay increase and clause in his contract that would allow him to box at the same time.
His demands are yet to be accepted, with Ngannou admitting at the UFC 272 press-conference that his future remains up in the air.
He said: “It’s been a long time since I was thinking about my future in the company. So nothing has changed. I’m still in the same position.”
“I’ve been to the UFC a lot so I want to exhaust all my options.”