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• Drug claim costs Mayweather

Top Rank Inc spokesman Lee Samuels said promoter Bob Arum was aware the 26-year-old Chavez tested positive for the banned substance.

"Julio Cesar Chavez Jr will have the opportunity to explain the situation to the Nevada State Athletic Commission," Samuels said. Samuels declined further comment.

Commission executive Keith Kizer wouldn't immediately provide the name, but said only one of 32 fighters who took part in bouts at two Las Vegas venues last Saturday tested positive for a banned substance, marijuana. Kizer said the commission was awaiting results of pre-fight tests for banned steroids, diuretics and masking agents before releasing all pre-fight and post-fight test results for all 32 fighters.

The commission can ban a fighter for one year and penalise him for up to 100% of his purse for a failed test, Kizer said.

Chavez was guaranteed $3-million for the WBC title fight against Sergio Martinez.

Martinez dominated the first 11 rounds at the Thomas & Mack arena, but had to withstand a frenzied 12th-round effort by Chavez to win a unanimous decision. Martinez ran his record to 50-2-2.