Testosterone replacement therapy (TRT) keeps Vitor Belfort from fighting in Las Vegas, Nev., but that could change though.

Coming off two "Knockout of the Night" finishes over top-ranked middleweights Michael Bisping and Luke Rockhold, "The Phenom" returns to the light heavyweight division to rematch former Pride champion Dan Henderson on Nov. 9 in Goiania, Brazil.

His decision to decline a bout against Tim Kennedy and move up to fight Henderson at 205 was made after he realized he had done enough to earn another title shot in the middleweight division. The only chance he returns to the Octagon at 185 pounds would be in a championship fight.

The Nevada State Athletic Commission won’t allow Belfort to use TRT in Las Vegas, once he tested positive in the state back in 2006 for an illegal substance, 4-hydroxytestosterone, in his first fight with Henderson. That’s one of the reasons why he hasn’t fought there since his first-round knockout loss to Anderson Silva.

However, Belfort revealed in an interview to UOL that he was already on the testosterone replacement therapy when he fought Silva, back in 2011.

"I’ve (been doing this) for three years," Belfort said. "I did some exams and they saw I had low testosterone levels. The doctor said ‘Vitor, we need to do something. I don’t know if you agree with this, but it’s important that you do it.’ And it was done."

"If you have something, if you need something, do it the right way. That’s what I do. I do blood tests all the time … It’s a process that you have to do."

Belfort wants to fight the winner or Chris Weidman vs. Anderson Silva, who meet at UFC 168, and he would accept to stop using TRT if that’s one of the conditions on him earning the shot at the gold.

"I’ve already said that, if they agree with it, I would (stop doing TRT)," he said. "No problem at all. If they want me to get there in a disadvantage, that’s ok.

"But they already told me that’s not the problem," he continued. "UFC told me, 'You can’t go in there with a disadvantage.’ The thing is, I’m in normal testosterone levels with TRT. That’s the treatment. People don’t seem to understand that I’m the only guy that does blood tests. Many fighters don’t do this, many use illegal stuff and are not tested like I am. I’m tested all the time. Week after week, month after month. I have to keep the levels normal to make it fair."