3:00pm update: Sonnen called into the Jay Mohr show to explain his situation. Audio now available above.
UFC light heavyweight Chael Sonnen has failed a random drug test in the state of Nevada and will not fight Vitor Belfort at UFC 175 on July 5, according to Brett Okamoto of ESPN.
The Nevada State Athletic Commission randomly tested Sonnen last month while he was in Las Vegas to attend a UFC news conference. Results confirmed the presence of two illegal substances, Anastrozole and Clomiphene.
NSAC chairman Francisco Aguilar confirmed the test results to ESPN.com on Tuesday.
UFC officials also acknowledged the situation.
"UFC officials acknowledge irregularities in a recent random test," the promotion stated. "Chael is planning on addressing the matter this afternoon."
The substances Sonnen tested postive for are classified as anti-estrogenic.
Sonnen, who resides in West Linn, is expected to discuss the test results on Fox Sports 1, where he currently serves as a UFC analyst.
Sonnen had previously been approved the use of testosterone-replacement-therapy (TRT) in his last six fights after he stated he was diagnosed with hypogonadism, which is a condition in which the body doesn't produce enough testosterone. He had been approved the use of testosterone-replacement-therapy (TRT) in his last six fights, twice in Nevada. The NSAC banned TRT in combat sports back in February, however, which forced Sonnen to suspend treatment.
This is the second time Sonnen has failed a drug test. In August 2010, he tested positive for an elevated testosterone-to-epitestosterone ratio prior to a UFC middleweight title fight against Anderson Silva. The California State Athletic Commission suspended Sonnen for one year.
Sonnen appealed the suspension where he revealed his medical condition and admitted use of TRT; his suspension was reduced to six months.
Sonnen was later suspended indefinitely by the CSAC on suspicion of perjury during that appeal. That suspension officially ended on June 29, 2011.
In 2011, Sonnen pleaded guilty to money laundering in connection with mortgage fraud. Sonnen was eventually fined $10,000 and sentenced to two years probation after he agreed to testify against others involved in the investigation.
Sonnen will likely be suspended, and the ESPN article states that he will not appeal that suspension.