Dillian Whyte's status as the WBC interim world heavyweight champion is in jeopardy.
He's been provisionally suspended by the organisation after testing positive for a banned substance.
The 31-year-old Englishman failed a drug test three days before he beat Oscar Rivas earlier this month.
Whyte has occupied the top spot in the division behind Deontay Wilder for more than a year and a half.

Iran wait on World Cup progress after draw with Egypt
Belgium beat New Zealand 5-1 to advance to World Cup knockout stage
Baena strike sends Spain past Uruguay into World Cup knockouts
Jubilant Cape Verde set date with Argentina in World Cup round of 32
Senegal ring up 5-0 win over 10-man Iraq, keep knockout hopes alive
