Chijindu Ujah, the British sprinter who won a silver medal at the Tokyo Olympics as part of Team GB’s men’s 4x100m relay team, has been suspended for a doping violation, the Athletics Integrity Unit has confirmed.

Ujah is one of four athletes who tested positive for a banned substance at the Games and who were named by the AIU on Thursday. According to the AIU, Ujah has tested positive for S23, a SARM (Selective Androgen Receptor Modulator) which aids muscle building and Ostarine, another SARM which is not a steroid but an anabolic agent.

The 27-year-old now faces the prospect of being stripped of his medal. That could also be the case for his teammates in Tokyo, Nethaneel Mitchell-Blake, Richard Kilty and Zharnel Hughes. There are no suggestions that any of those three have tested positive for a banned substance.

The other three athletes suspended are Moroccan 1,500m runner Sadik Mikhou, Georgian shot putter Benik Abramyan and Kenyan sprinter Mark Otieno Odhiambo.

The AIU said it worked closely with the International Testing Agency during the Games and provided the intelligence to carry out specific target testing on two of the four athletes. “The AIU now awaits the conclusion of the ITA proceedings against the above athletes, which will determine whether any anti-doping rule violations have been committed and what consequences [if any] should be imposed in relation to the Olympic Games,” read a statement.

More details to follow …