Francis Ngannou has taken the UFC by storm, boasting a 17-3 record while possessing the current title of heavyweight champion.
The Cameroonian's last fight came back in January, where he defended his title against Ciryl Gane by winning a decision after five gruelling rounds of action.
But at 35 years old, Ngannou's fighting career is likely entering it's twilight years, and a former opponent of his suggested that he should retire from the UFC and focus on other opportunities.
Curtis Blaydes faced Ngannou twice in his career, with the pair's first fight taking place in 2016 when a doctor stoppage in the second round handed Ngannou the victory.
A rematch took place in 2018, and the fight saw a repeat result but in quicker fashion, with Ngannou taking just 45 seconds to wrap up the win.
But Blaydes - who is now on a two-fight win streak of his own - suggested that Ngannou should stop while he's on top.
"If I were him, I would retire from MMA," Blaydes said. "He's already done enough. He's not gonna earn as much as he would earn in boxing.
"I would take the bag, take the opportunity to earn $40 million."
Ngannou has recently been linked with a blockbuster clash with boxing heavyweight champion Tyson Fury - who suggested he'll retire from the sport after his win against Dillian Whyte back in April.
But while speculation about a fight between the two heavyweights continues, Ngannou responded to Blaydes and suggested that his UFC career is far from being over.
'The Predator' took to Twitter to respond to Blaydes, suggesting he's still got another five years before hanging up his gloves.
"I'm just getting started bro! I have at least 5 more years to conquer everything."