World Boxing Council President Mauricio Sulaiman is urging unbeaten heavyweight Tyson Fury to enrol in the organization's Clean Boxing Program.

Fury will challenge WBC heavyweight champion Tyson Fury on December 1 at Staples Center in Los Angeles California. Showtime Pay-Per-View will carry the fight.

According to Sulaiman, they have not yet sanctioned because Fury has not enrolled in the CBP. The WBC uses VADA (Voluntary Anti-Doping Association) to run the program.

Fury faced testing issue in the past, when he came up positive for a banned substance in early 2015 - around the time of his fight with Christian Hammer. He reached a deal with UKAD (the testing regulator in the UK) for a two-year back-dated ban.

Fury had been inactive since November 2015, when he shocked Wladimir Klitschko for the unified heavyweight crown with a twelve round unanimous decision in Germany. Then due to issues with depressions and recreational drugs, he was on the shelf and eventually lost his titles.

He finally returned to the ring in April of this year, and since then he's picked up two wins.

Sulaiman plans to contact Fury, to push the process along.

"If he does not enrol, then the WBC cannot sanction the fight," Sulaiman exclusively told Sky Sports.

"If Tyson Fury does not enrol in the clean boxing program, the fight is not for the WBC title. He cannot win the title. He told me personally, publicly on Twitter. He sent a message, he had a fight, and he has been struggling with paperwork, so we understand that. We have that flexibility in our protocol, but now it's time. Time is now."

"I would say this week [he must enrol]. I'm going to reach out to him, because there has to be testing for the fight, out of competition. The time is of essence. Hopefully he will enrol."