Joe Rogan reveals one of his biggest regrets

admits his biggest regret in the MMA world is 's failed negotiations with 'gangster-type characters' which brought a potential super-fight between Fedor Emelianenko and Cain Velasquez crashing down.

Emelianenko and Velasquez, who was recently over attempted murder and gun assault charges, are considered two of the best heavyweights the sport has ever seen, with both men winning world championships in ex-Japanese promotion PRIDE and the UFC respectively.

And while they competed in different organizations, Rogan - who has spent over two decades as a UFC commentator - has revealed MMA fans were almost treated to a mouthwatering showdown between the now-retired pair at one stage.

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