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While Conor McGregor spent the last week going toe to toe with Floyd Mayweather Jr. on the microphone, former world champion Jessie Vargas cast further doubt on whether McGregor can hang with Mayweather in the ring.

In an interview with Villainfy Media, Vargas said McGregor got knocked out during a sparring session in preparation for his Aug. 26 bout with Mayweather.

(Warning: Video contains NSFW language.)

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