The WBC has suspended Dillian Whyte's status as interim champion and mandatory challenger over his failed drugs test.
Whyte is alleged to have failed a test before his victory over Oscar Rivas earlier this month but was cleared to fight.
Whyte became the WBC's interim heavyweight champion and mandatory challenger with his victory over Rivas.
A statement read: "An a Sample UKAD collected from Mr. Dillian Whyte in relation with his bout against Oscar Rivas yielded an adverse finding.
"In light of that adverse finding, and pending the outcome of the WBC's own investigation and adjudicatory process, the WBC is provisionally suspending the WBC's recognition of Dillian Whyte as WBC Interim World Heavyweight Champion and Mandatory Challenger of the division.
"The WBC has notified Mr. Whyte and his team of the WBC's suspension and that it will afford Mr. Whyte the opportunity to present its position to the WBC at an investigative hearing which will take place at a place and time to be announced in the near future.
"Throughout its investigation and hearing, the WBC will afford Mr. Whyte and his team the opportunity to present any available information and materials, and any exculpatory evidence they might deem appropriate."
Speaking last week, Whyte said: "I am so disappointed with the rubbish that has been said about me over the last few days.
"I have lawyers dealing with it and I have been told that I can't talk about it for good legal reasons. I was cleared to fight and I won that fight fair and square."
