Former UFC middleweight champion Anderson Silva has denied intentionally using any performance enhancing drugs at any point during his career despite testing positive just days before his last fight.
According to the Nevada State Athletic Commission, Silva's blood contained metabolites from drostanolone and androstane, two anabolic steroids, when he was tested ahead of his fight against Nick Diaz in January 2015.
The Brazilian went on to claim the positive tests were the result of using a sexual enhancement supplement, but was still banned for a year, fined a total of $380,000 and had his unanimous decision victory changed to a no contest.
Silva will make his return from the ban on January 27 at UFC Fight Night 83 in London against home favourite Michael Bisping.
Bisping has been vocal in his condemnation of the former champion's performance enhancing drug use, but Silva has brushed aside the Englishman's criticisms.
"I don’t have to prove absolutely anything to Bisping or anyone else besides myself," Silva said in a conference call with journalists.
"I never needed any illegal substance, steroid or anything like that. I made a mistake, and everyone can make mistakes. I never tested positive before.
“I was questioned by the commissioner, and he was arrogant and ironic by asking me if I had ever been randomly tested before. I said no, because I never had any problems with doping and I never used it. My body is the same ever since I started fighting until now."
"I’m ready to be tested at any moment. I’m not perfect, I’m not a saint. I really made a mistake by taking a substance that was tainted. I never intended to expose my personal life to clear the facts the way I did.
“I never took any kind of steroid. My lawyer and the guy that tested the supplements I took were not able to prove the truth. My suspension is coming to an end. I made a mistake and I’m paying for it. I’m ready to fight again, and I’m happy about it.”
Silva lost his title to Chris Weidman via knockout in July 2013 and lost the rematch in December of that year by technical knockout after he breaking his shin bone when Weidman checked an attempted leg kick.
Weidman went on to defend his title against Silva's fellow Brazilians Lyoto Machida and Vitor Belfort, but lost to Luke Rockhold at UFC 194 in December 2015.
Silva, 40, says he hopes to fight his way back into title contention, starting with the bout against Bisping on Saturday.
"I have a dream that I'm going after, and that's to get that belt back. I'm going to do it. I'm going to try my best to get back there and get it done," he said.
"Definitely some things have definitely changed. Definitely I've had a change when I've looked at it, and I've definitely changed my mind.
“I'm very motivated to come back and prove that I'm still one of the best and that I'm going to bring this belt back to Brazil. It's just a matter of getting the opportunity to do that."