Anderson Silva failed a couple drug tests for his UFC 183 middleweight clash with Nick Diaz, and he guarantees he has no idea why.

In a video interview with TMZ, the former UFC middleweight champion claimed he doesn’t know what actually happened for him to test positive for drostanolone, androstane, oxazepam and temazepam.

"I don’t know what happened. I’m surprised," "The Spider" said. "When my manager called me and said ‘Anderson, we have a problem because you go to the test for the commission is bad’. I said, ‘What, I don’t know what happened’."

Asked if the positive test was a result for some medication he might have used for his broken leg, Silva responded "yeah, but I don’t think so. I need to check all the supplements I use."

Silva will likely be suspended by the Nevada Athletic Commission, and the calls the whole situation "bad" for the sport and himself.

"I think this is bad for the sport, it’s so bad for me and my life," he said. "And that does nothing to change my performance in the fight."

The unanimous decision victory over Diaz will likely be overturned to a no-contest, and Silva suggests a rematch with the former Strikeforce welterweight champion to prove his win was legit.

"I respect the commission now," he said. "When all this (is) done, I go fight Nick next one."