caneloCanelo Alvarez has tested positive for the banned substance clenbuterol.

He is scheduled for a rematch with the middleweight champion Gennady Golovkin on May 5 in Las Vegas – it is unclear whether the positive test will affect the fight.

Canelo, who is training in his hometown of Guadalajara, Mexico, provided urine samples on Feb. 17 and Feb. 20, and both tests came back positive for trace amounts of clenbuterol.

Clenbuterol has shown up in drug tests for many Mexican athletes in recent years because of meat contamination in the country.

“As part of the voluntary testing program that Canelo Alvarez insisted on ahead of his May 5 fight, one of his results came back positive for trace levels of clenbuterol, consistent with meat contamination that has impacted dozens of athletes in Mexico over the last years,” Golden Boy Promotions, Canelo’s promoter, said in a statement addressing the positive test.

Canelo said he was embarrassed by the positive test.

“I am an athlete who respects the sport and this surprises me and bothers me because it had never happened to me,” he said in a statement. “I will submit to all the tests that require me to clarify this embarrassing situation and I trust that at the end the truth will prevail.”

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