Team GB 4x100m relay silver medallist CJ Ujah has been suspended for a suspected doping violation.

If proven, the entire British relay team will be disqualified.

The Athletics Integrity Unit (AIU) confirmed Ujah had been provisional suspended after a test showed the “presence/use of a prohibited substance (Ostarine and S-23)”.

The ITA reports that a sample collected from Ujah Chijindu, sprinter from Great Britain, has returned an Adverse Analytical Finding for Ostarine and SARMS S-23.

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These are selective androgen receptor modulators (SARM) and help with building muscle.

The International Testing Agency (ITA) says the relevant sample was collected after the 27-year-old competed in the 4x100m final at the Tokyo Olympics on 6 August.

The result was reported at a laboratory two days later.

Ujah now has the right to request the analysis of his B-sample.

If requested, and if the B-sample confirms the initial finding – or if Ujah does not wish to have further analysis done – the case will be referred to the anti-doping division of the Court of Arbitration for Sport.

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The world athletic anti-doping rules state: “Where the athlete who has committed an anti-doping rule violation competed as a member of a relay team, the relay team shall be automatically disqualified from the event in question, with all resulting consequences for the relay team, including the forfeiture of all titles, awards, medals, points and prize and appearance money.”

As well as the British athlete, Bahrain’s 1500m runner Sadik Mikhou, Georgian shot-putter Benik Abramyan and Kenya sprinter Mark Otieno Odhiambo have also been provisionally suspended following adverse tests, the AIU confirmed.

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Ujah, Zharnel Hughes, Richard Kilty and Nethaneel Mitchell-Blake claimed silver in Tokyo after being beaten to the gold by Italy by just 0.01 seconds.

There is no suggestion any of his team mates tested positive for a banned substance.

Once the matter is settled, the case will be referred to the Athletics Integrity Unit (World Athletics) to follow up on sanctions beyond the 2020 Olympic Games.

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