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Middleweight fighter Julio Cesar Chavez Jr. could be stripped of his $3-million US dollar purse, depending on the explanation he offers to Nevada boxing regulators about a positive test for marijuana after his first professional loss last weekend in Las Vegas.

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Days after his first ever professional loss, middleweight fighter Julio Cesar Chavez Jr. could be stripped of his $3-million US dollar purse, after testing positive for marijuana.

Top Rank Inc. spokesman Lee Samuels said "Chavez Jr. will have the opportunity to explain the situation to the Nevada State Athletic Commission."

The 26-year old Mexican, seen here at the weigh-in for his losing fight against Argentina's Sergio Martinez, has been suspended before.

In November 2009 a win over Troy Rowlands was changed to a no-contest after Chavez tested positive for a banned diuretic.

He has also struggled to make weight for several bouts.