Brock Lesnar is ‘absolutely doping’ in the mind of one former UFC champion.

The 41-year-old reigned over the heavyweight division from 2008 to 2010 as UFC heavyweight champion but a series of losses led the current WWE star to take a spell away from the cage.

Lesnar ultimately made a return to the Octagon in 2016 with a bout against Mark Hunt at UFC 200 but his unanimous decision victory was later ruled a no contest due to a pair of failed doping tests.

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Confronting new heavyweight champion Daniel Cormier in the Octagon after the Louisiana native’s victory against Stipe Miocic, UFC president Dana White confirmed Lesnar would be returning to the organisation.

However, not everyone is convinced Lesnar is clean again.

Ex-bantamweight champion and UFC colour commentator Dominick Cruz said of Lesnar on the Scott & BR Radio Show:

If he makes it to the fight I’d be shocked.

And I just mean that because USADA is the toughest anti-doping system there is on planet Earth, and that guy is absolutely doping. Period. No ifs, ands or buts about it. And he’s not been in mixed martial arts, so of course he’s been doing that stuff. How they’re going to get him to be clean on fight night is beyond me.”

Lesnar will clear the United States Anti-Doping Agencies sanctions in early January should he continue to pass regular tests and the former champion would be able to compete immediately once his suspension is over.