A professional bodybuilder has knocked a judge to the floor after losing a competition.

Giannis Magos was declared the winner of the 100kg division and reportedly thought nothing stood between himself and the 2016 IFBB Diamond Cup.

However, after not being declared the overall winner, Magos went into a fit of rage.

Footage has emerged of the bodybuilder approaching long-time judge Armando Marquez and slapping him across the face.

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It has also been reported Magos then threw the judges' tables and pulled out his genitals, which was not shown on video.

Social media users have called for his immediate suspension saying that Magos' actions were shameful.

"Shame on you Giannis Magos (Greece). You're not an athlete. No sportsman," wrote one user on Twitter.

Evolution Of Bodybuilding, a leading bodybuilding news website, has called for Magos to receive the harshest possible penalty.

"There is no place for the actions that followed in the any sport and especially in bodybuilding", their statement read.

"Armando [the judge] is a true gentleman to the sport of bodybuilding and is one of the hardest workers in the organisation.

"The competitor that was involved in the incident should get the harshest penalty that the IFBB can give."