Former UFC champion is coming to grips with the end of his career.

Former UFC middleweight champion Anderson Silva is currently in hot water. If you recall, Silva was pulled from his bout against Kelvin Gastelum at the UFC Fight Night 122 event November 25, 2017, at Mercedes Benz Arena in Shanghai, China on the promotion’s streaming service, UFC Fight Pass, after he was flagged due to a potential U.S. Anti-Doping Agency (USADA) violation.

This bout would have marked Silva’s (34-8 MMA, 17-4 UFC) first appearance in the world famous Octagon since February when he competed against Derek Brunson at UFC 208.

Silva won the bout by decision, which snapped a two-fight losing streak. Silva had hadn’t had an official UFC win since 2012.

They were originally scheduled to fight each other at UFC 212 in Rio de Janeiro, but Gastelum had to be pulled from the bout after testing positive for marijuana metabolites in a test stemming from a previous bout with Vitor Belfort.

The promotion then was searching to find a replacement for Silva at UFC Fight Night 122, and they found former UFC middleweight champion Michael Bisping who agreed to fight Gastelum at the event.

As seen at the event, Gastelum beat Bisping by first-round KO. This marks the first time that Silva has potentially violated the U.S. Anti-Doping Agency program.

However, this isn’t his first time failing a drug test as he is a repeat offender. If you recall, he failed a drug test around the time of his UFC 183 fight with Nick Diaz in January 2015 before USADA partnered with the MMA promotion.

As a result of that failure, he received a one-year suspension and $380,000 fine from the Nevada State Athletic Commission. At the time, Silva claimed that the reason he failed was due to a tainted sexual enhancer.

Silva told TMZ Sports on Tuesday (transcript courtesy of MMA Fighting) that his latest failed drug test could be blamed on tainted supplements.

“Maybe the supplements I’m using are contaminated,” Silva told TMZ. “I don’t know. I’m just waiting. Because obviously if I take these steroids, I’m stupid. I’m too old. I’m not at the start of my career. I’m [at the] finish.”

Silva ignited public imagination with talks of a super fight with Roy Jones Jr a few years ago.

“I’m just waiting for USADA and my lawyers,” Silva said. “And hopefully they came back soon for fight for Roy Jones. That’s my dream,” Silva said. “Hopefully, this fight comes.”

“A lot of people are talking about that,” Silva said. “But it’s difficult. It’s easy for talk for doctors about that. Sometimes the athlete using the different supplements, because the rules are not easy. It changes all the time.”