UFC legend Anderson Silva is still adamant he never knowingly used steroids -- but says if the positive test results are accurate, the only explanation is "contaminated supplements."
Silva tested positive for two banned substances in a U.S. Anti-Doping Agency drug test conducted back in October. Silva is now facing a maximum 4-year suspension from fighting.
But, "The Spider" tells TMZ Sports he would NEVER knowingly juice up -- saying it would be a "stupid" thing to do at the tail end of his career.
His explanation -- "Maybe the supplements I'm using are contaminated."
Silva says his lawyers are still fighting to clear his name -- and he's confident he'll fight again.
In fact, he's still focused on getting a fight with boxing legend Roy Jones Jr.
And get this ... if 42-year-old Silva IS banned for 4 years -- he does NOT plan on retiring ... insisting he'll still take a fight even in his late 40s because he loves the sport so much.
"This is my heart. This is my life."
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