It’s Michal Oleksiejczuk’s turn to deal with the USADA.

On Thursday, officials announced that Oleksiejczuk failed an in-competition drug test taken in conjunction with his Dec. 30 fight vs. Khalil Rountree at UFC 219 in Las Vegas. The 22-year-old Pole defeated Rountree by unanimous decision, but could see that result overturned in addition to facing other sanctions from both the USADA and the Nevada State Athletic Commission.

Last November, what would have been Oleksiejczuk’s debut bout was affected by a USADA violation, though in that case it was opponent Ion Cutelaba who was flagged leading to their UFC 217 meeting being canceled.

Oleksiejczuk (13-2) is currently on a 10-fight win streak.