British Olympic athlete and silver medallist Chijindu Ujah has been provisionally suspended for an alleged doping violation at the Tokyo Olympics, the Athletics Integrity Unit, or AIU, said.

Ujah, 27, was part of Team GB men's 4x100m relay team, which won silver at this month's delayed Tokyo 2020 Olympic Games.

The news means the quartet could all face being stripped of their medals, with Canada moving to silver medal and China receiving bronze, if Ujah is found guilty.

"The result was reported by the WADA (World Anti-Doping Agency)-accredited laboratory of Tokyo on 8 August 2021," the AIU, under the International Association of Athletics Federations, said in a statement.

The athlete has the right to request the analysis of the B-sample, it said.

"If requested by the athlete and if the B-sample analysis confirms the adverse analytical finding… the case will be referred to the anti-doping division of the Court of Arbitration for Sport for adjudication.

"It will consider the matter of the finding of an anti-doping rule violation and the disqualification of the men’s 4x100 relay results of the British team," it said.

A spokesperson for the British Olympic Association said: "We are aware of the Athletics Integrity Unit statement, and the BOA will respect due process in this matter."