Oleksiejczuk flagged by USADA for potential doping violation

UFC light heavyweight Michal Oleksiejczuk has been flagged by the USADA for a potential doping violation stemming from a sample collected in relation to his fight with Khalil Rountree at UFC 219 on Dec. 30, the promotion announced Thursday.

The promotion's anti-doping partner didn't specify which substance is responsible for his flagging, but will fill in the Nevada State Athletic Commission - UFC 219's sanctioning body - as needed.

Oleksiejczuk filled in for an injured Gokhan Saki on short notice and took what marked his promotional debut by unanimous decision.