A GP who claimed to work with Tyson Fury and Conor Benn is facing scrutiny from the British Boxing Board of Control (BBBofC) after another fighter failed a doping test.

The activities of Dr Usman Sajjad are being “carefully considered” after European super-bantamweight champion Dennis McCann was suspended last month.

Dr Sajjad, who is listed at Churchtown Medical Centre in Southport, claims on his Instagram page that he is “doctor for the champ” Fury and also lists Benn among his clients.

The GP was working with Benn when the boxer tested positive in 2022 and said in a podcast interview the same year that he believed “80 to 90 per cent” of elite boxers could be using drugs. Benn has since been cleared to compete again after the National Anti-Doping Panel cleared him of any wrongdoing over his two positive drugs tests in 2022.

McCann, meanwhile, was removed from the Fury v Oleksandr Usyk rematch undercard on December 21 due to an adverse finding in his pre-fight test with the Voluntary Anti-Doping Association (Vada). The Sunday Times reports McCann tested positive for two banned anabolic-androgenic steroids, drostanolone and trenbolone.

Robert Smith, the general-secretary of the BBBofC, has now confirmed to the newspaper that Dr Sajjad is a subject of interest for the national governing body.

“The board is aware of the situation and is taking the matter very seriously and can confirm the activities of Dr Usman Sajjad are being carefully considered,” Smith said in a statement.

Frank Warren, McCann’s promoter, has previously told BoxNation that the undefeated former British and Commonwealth champion “swore to me that he has not taken any performance-enhancing drugs”. McCann is suspended while UK Anti-Doping investigates his case. Dr Sajjad has previously denied any involvement in the supply of performance-enhancing drugs. He and McCann’s advisor have yet to respond to requests for comment.