Harrison won super heavyweight gold at the Sydney Games and was tipped to become a world champion in the professional ranks.
BBC: WBA champion David Haye to fight Audley Harrison
Former world amateur champion Gavin continued his perfect start to professional boxing with a second-round stoppage win over veteran Steve Saville.
BBC: Smith beats Quigley in thriller
Mayweather is now unbeaten in 38 professional encounters, while De la Hoya, a six-weight world champion, fell to 38 wins and five losses.
BBC: Mayweather overcomes De la Hoya
Gavin is Britain's first ever amateur world champion and he fancies his chances of emulating Khan's success of holding a professional world title.
BBC: Gavin after title shot with Khan
"It's fantastic to turn professional under Frank Warren who is the man to guide me to achieve my dream - to become world champion, " continued Johnson.
BBC: Delhi champion Callum Johnson set for Glasgow bow
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