Charr's A sample from an Aug. 31 test showed "two suspect substances" and due to time constraints regarding the opening and testing of the B sample the bout was now cancelled.
"I cannot explain it and I am asking myself how could it happen," the fighter, who lives in Cologne, told the Koelner Express newspaper.
"I have never taken anything. I fought Vitali Klitschko and Alexander Povetkin, seven title fights and I was always a clean athlete. "Why should I take something before the fight against Fres Oquendo."
The 33-year-old Charr (31-4) had won the WBA title against Russia's Alexander Ustinov last year.
(This version of the story refiled to fix typo in headline).
(Reporting by Karolos Grohmann, editing by Pritha Sarkar)
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