The following video of Conor McGregor sparring with former IBF champion Chris "The Heat" Van Heerden (23-2-1) at the Box 'N Burn gym in Brentwood, California has just emerged.
This will no doubt continue to fan the flames of the continuously rumored McGregor vs. Mayweather match-up.
Donald Cerrone and Bas Rutten aren't convinced the fight will happen (click here to see), are you?
