Back at UFC 200, Brock Lesnar made his triumphant return to the Octagon when he defeated Mark Hunt via unanimous decision in the co-main event of the historic card.

Following the bout, Lesnar revealed that he could potentially be making a run at heavyweight, as he left the door open for future UFC fights.

Now, Brett Okamoto of ESPN has revealed that the UFC has been notified of a potential anti-doping violation for Brock Lesnar stemming from a June 28th drug test.

The UFC has been notified of a potential anti-doping violation by Brock Lesnar, stemming from June 28.

— Brett Okamoto (@bokamotoESPN) July 15, 2016

Remember, Lesnar was first retired athlete to receive an exemption from UFC to skip a mandatory 4-month drug testing window ahead of fight.

— Brett Okamoto (@bokamotoESPN) July 15, 2016