Top Rank's CEO, Bob Arum, admits he's concerned after the recent drug testing blowup in the aftermath of last month's heavyweight bout between top contenders Dillian Whyte and Oscar Rivas.

On July 17, Whyte was advised that an 'A' sample collected during a June drug test had an adverse finding.

The test in question was administered by UKAD (UK Anti-Doping). Whyte was also tested, before and after the fight, by VADA (Voluntary Anti-Doping Association) - and his VADA tests were all clean. 

Whyte's test with UKAD had come up positive for two metabolites of a banned substance.

On the day of the fight, which took place on July 20, Whyte appeared before the National Anti-Doping Panel, who cleared him to fight.

Whyte went forward with the bout and won a twelve round unanimous decision over Rivas.

The status of Whyte's 'B' sample is unknown. The boxer's legal representatives are sorting out the matter with the British Boxing Board of Control and UKAD.

What concerns Arum, is the fact that Rivas and his entire team were unaware that Whyte had an issue with a drug test - and they were also unaware that Whyte appeared at a hearing on the day of the fight.

Arum feels strongly that the British Boxing Board of Control should have immediately notified Rivas when they became aware that Whyte had a problem with one of his drug tests. And he also believes Rivas and his handlers should have been present at Whyte's hearing.

Later this month, one of Arum's biggest stars, Vasiliy Lomachenko, is traveling to London to face Luke Campbell in a lightweight unification.

"Ordinarily I wouldn't be concerned but ask me if I am and damn right I am because I don't trust the British board," Arum told BBC Sport.

"Commissions, whether it is in the US, or the British Boxing Board of Control - who in this area look totally inept - I think it would be a good thing to have an internationally recognised body taking over the testing problem.

"I was very upset with what I read with the Whyte situation. What made me upset was not the ultimate decision to let him fight but the fact that the opponent was never given any notice that Whyte had tested positive at least in his 'A' sample. That was absolutely wrong.

"You don't do that to an opponent. Whoever handled this made a terrible, terrible mistake. This is a serious business - guys can get hurt. Give the fighter notice and let him also be in on the decision. Boxing needs a standard on drug testing. It has to be addressed right away, as early as next week. This is a serious, serious problem."