RIO DE JANEIRO -- Anderson Silva failed multiple drug tests for his UFC 183 fight with Nick Diaz, but still doesn’t know how that happened.

The former UFC middleweight title will appear in front of the Nevada Athletic Commission in April, and revealed on Thursday night that his hearing was postponed so the lab could analyze everything he used during his treatment for a broken leg and his training camp for UFC 183.

And even if he proves his innocence, Silva won’t be back in the Octagon before 2016.

"I will be back next year," Silva said during a quick Q&A session with fans after a seminar in Rio de Janeiro. "We don’t know yet what’s going to happen because all the stuff I used during the treatment for my broken leg and my supplements were taken to the commission’s lab to be examined so we can find out what happened. I don’t know what happened. It was a surprise for me as well. Coming back next year was my plan anyway, so it’s normal."

Asked why he signed a new multi-fight deal with the UFC before his bout with Diaz, the 39-year-old fighter said he wants to fight for five more years.

"That was an offer from Dana and Lorenzo," he said. "The only serious injury I had was on my leg now. I spoke with my team, we discussed everything and saw that it was possible. We’re training now focused on fighting for five more years. I already have my schedule for the next five years. If we can fight more, two or three times a year, it’s better."

Chris Weidman, who defeated Silva twice inside the Octagon, puts his middleweight title on the line against Vitor Belfort on May 23. Ronaldo Souza, Yoel Romero, Luke Rockhold and Lyoto Machida are gunning for shots at the gold, and "The Spider" knows he will have a long way until he thinks about fighting for the belt one more time.

"First of all, I have to earn it," Silva said of fighting for the UFC title one more time. "The fighters who are up there earned that spot, to fight for the UFC title, and I have to conquer my space in the division again. Step by step, starting from zero. I don’t know if I will have enough time for that, but if I have the opportunity to earn it, it’s possible."