By Miguel Rivera

The rivalry between IBF, IBO, WBA, WBC middleweight champion Gennady Golovkin and challenger Canelo Alvarez - completely exploded on Tuesday, when GGG accused the Mexican superstar of being a longtime user of performance enhancing drugs.

Canelo came up positive for clenbuterol in two separate drug tests, on February 17 and February 20. The drug tests were administered by the Voluntary Anti-Doping Agency.

Canelo and Golovkin are scheduled to collide in a rematch on May 5th, at the T-Mobile Arena in Las Vegas.

Canelo and his handlers have attributed the positive tests to food contamination, which is a common problem with the meat in Mexico.

Golovkin has his own theories, which he explained.

"I'm a clean athlete. After the first fight I knew he was not clean," Golovkin said to reporters. "Have a look at the pictures they post when he uses some pills. Let him explain what kind of pills they are.

"I told you, it's not Mexican meat. This is Canelo. This is his team. This is his promotion. ... Canelo is cheating. They're using these drugs, and everybody is just trying to pretend it's not happening. It was pretty obvious when (Canelo's) muscles were all (enlarged) ... and with the traces of injections, which were visible," Golovkin said. "I can talk about Oscar De La Hoya, too. He is also not clean. He's dirty.

"You should take a look at the photos and ask a doctor. Ask any doctor. Let him explain what those (muscles) are. It's better even to use the lie detector. Then there wouldn't be any silly questions about meat or fruits or chocolate."

Golden Boy Promotions President Eric Gomez, who promotes Canelo, believes Golovkin is displaying fear and he's simply preparing post-fight excuses in the event of defeat.

And Gomez informed BoxingScene.com on Tuesday, that Golovkin's statements may generate some legal consequences in the future.

"For me that sounds more like fear, not having the confidence in what they are doing to win the fight, they are just excuses," said Gomez to ESPN Deportes.

"Obviously we believe and we are confident that Canelo is a clean fighter, but we will wait for the Nevada Commission and the parties involved to make their statements so that everyone will see that he actually is - but they are definitely looking for nothing more than excuses.

"Obviously we will wait until the investigation of the Nevada Commission concludes, and once the results come out - we will then determine if we intend to proceed in any way against these statements [that Golovkin made]."