New Delhi, April 22 -- Heavyweight title contender Lawrence Okolie failed a drugs test ahead of his fight scheduled Saturday against former Olympic champion Tony Yoka.

The bout's promoter Queensberry announced the positive test Tuesday without giving further details about the case, and later canceled the entire show in Paris.

Okolie wrote in a social media post: "I will of course be fully cooperating with all relevant authorities and I'm confident any investigation will clear my name."

The 33-year-old British boxer faces a ban of up to four years unless he can prove he was not to blame for the positive doping test.

Okolie is a former world champion at cruiserweight who moved up to heavyweight. He is the No. 1-ranked contender by the W...