A winner at UFC Sacramento has failed a drug test, ESPN confirmed Monday.
John Allan, who defeated Mike Rodriguez on the card, tested positive for the prohibited substance tamoxifen in an in-competition drug test, California State Athletic Commission (CSAC) executive officer Andy Foster said. UFC Sacramento took place July 13 at Golden 1 Center. Allan won by unanimous decision.
MMA Fighting was the first to report the news of Allan's failed test.
Tamoxifen is an estrogen modulator used clinically to treat and prevent breast cancer. Its estrogen-blocking properties can alleviate side effects of anabolic steroid use.
Allan is facing a suspension from the U.S. Anti-Doping Agency, the UFC's anti-doping partner that administered the test. He will also face a suspension, fine and loss of his victory under the jurisdiction of the CSAC, which regulated his bout with Rodriguez.
Allan (14-5) was making his UFC debut at UFC Sacramento. He is on a two-fight winning streak, though the victory over Rodriguez will likely be overturned into a no contest. Allan, 26, fought and lost on Dana White's Contender Series Brazil in August 2018.