According to World Boxing Council President Mauricio Sulaiman, heavyweight contender Jarrell Miller refused to enroll in the WBC's Clean Boxing Program, which is the governing body's drug testing program.
Miller was scheduled to fight next week in Las Vegas, but his ring return was canceled after he tested positive for banned performance enhancing drug. He is expected to receive a lengthy suspension from the Nevada State Athletic Commission.
The latest infraction marks the third time in Miller's career that he tested positive for a performance enhancing drug.
He tested positive for a banned substance in the aftermath of a kickboxing fight in 2014, and was banned from fighting for nine months.
Then last year he tested positive for three illegal performance enhancer and was removed from a scheduled June fight with unified heavyweight champion Anthony Joshua.
Sulaiman explained that Miller has been excluded from the WBC's rankings for the last three years for his refusal to enter the Clean Boxing Program.
"Miller specifically, he was expelled from the WBC, because he failed to enroll in the clean boxing program. Not once, but twice," Sulaiman told Sky Sports.
"What I can say is that he's been out of the WBC picture for three years, because we did not consider him to be eligible for rankings, because he did not enroll in the clean boxing program.
"When he was first ranked. We sent them the documents. He had three months to fill three pieces of paper, and he failed to do so. Then somehow they claimed they didn't have the papers, so we rang him again and sent them the paper, and he didn't submit twice, so he has been expelled from the WBC for three years."
