UFC lightweight Gleison Tibau has been notified of a second potential anti-doping violation stemming from an in-competition test administered by the United States Anti-Doping Agency (USADA) at his fight on Nov. 7 in Brazil.

Tibau had previously been flagged from a test given prior to his bout with Abel Trujillo, who he defeated by a first-round submission.

"The U.S. Anti-Doping Agency (USADA) has notified both Gleason Tibau and UFC of a potential Anti-Doping Policy violation stemming from an in-competition sample collected immediately after his bout in Sao Paulo, Brazil on November 7, 2015. Tibau and UFC were previously notified that he had been provisionally suspended due to a potential Anti-Doping Policy violation stemming from an out-of-competition test," UFC officials said in a statement released on Wednesday.

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"USADA, the independent administrator of the UFC Anti-Doping Policy, will handle the results management and appropriate adjudication of this case involving Tibau. Additional information will be provided at the appropriate time as the process moves forward."

Tibau previously released a statement surrounding his original drug test failure saying he was flagged for using recombinant human erythropoietin (EPO), although he said at the time that he was innocent of any wrongdoing.

"I'm not used to an easy life," Tibau wrote. "Since I was a kid, I have fought for everything I've conquered, I have overcome adversities, and I'm really proud of who I am. I face this doping news as another stone that I have to take out of my way as a professional fighter and a correct citizen.

"As a responsible man that I am, I never believed I ingested something that could fantasize my performances. I make sure I have a healthy life outside the sport, and honest and clean inside the sport. I train hard, I do my best."

Tibau still hasn't faced a penalty for the first drug test that was flagged, but based on the current stipulations from the UFC and USADA, he could face at least a two-year suspension from the sport with a potential four-year suspension possible.

Tibau has competed in the UFC for 26 fights going back as far as 2006 but if he ends up suspended for the minimum of two years based on the current penalties, he wouldn't be eligible to return before he is 34.