UFC star Kamaru Usman says Conor McGregor's days as a champion are over.

Notorious has not fought since his most recent setback against Dustin Poirier after he suffered a broken leg in his UFC 264 trilogy fight with The Diamond.

McGregor, 34, has apparently made a full recovery from surgery after having an intramedullary rod inserted into his tibia and a plate with screws attached to his fibula.

The star - who has been on the sidelines for well over a year now - provided his fans with an update this week, saying and claiming he will make 'the greatest and the biggest comeback in sporting history.'

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UFC welterweight champion Usman told the 'I Am Athlete' podcast that he reckons McGregor will still carry on competing.

But as far as he is concerned he thinks his best days are now behind him as he looks to pursue a career in Hollywood.

Usman said: “He’s not necessarily done, but he’s done as a champion.

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Kamaru Usman is the current UFC welterweight champion

“This is my perspective, because when I fight guys, I study their hearts. When I watch fights, I watch their heart and for me, he’s done. He’s done, because I don’t know whether the goal was to get the money.

“I don’t know if that’s what it was, because there’s a story about him: He was broke. For me, it seemed like it was about not being broke, getting money.

"So I understand that. Now he’s not broke. But how are you gonna be champion, because that’s what drove you to become champion, because you didn’t want to be broke? Now you’re not broke anymore.”

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Conor McGregor is expected to return to the UFC Octagon later this summer

Usman, 35, is set to defend his welterweight title against Leon Edwards later this month in the main event of UFC 278 on August 20.

Should he get past Edwards, Usman admits he would find it difficult to turn down a fight with McGregor, but doubts he would take it.

He added: “He could call me out, but that don’t mean he’s going to fight me.

“It’s not necessarily that they protect him, because he’s bigger to where he can pick, where he can call his shots.

"He’s that big. Conor can say, ‘I’m going to fight you tomorrow,’ and he’s still gonna sell 1 million buys… absolutely, I’d grab that check.”