CJ Ujah, 27, tested positive for two SARMs (Selective Androgen Receptor Modulators) enobosarm and S-23, banned substances that help to build muscle. He was initially suspended pending the outcome of an investigation by the Athletics Integrity Unit and a hearing at the Court of Arbitration for Sport.
However, the hearing found that he did commit a violation, and all four members of the team (Ujah, Nethaneel Mitchell-Blake, Richard Kilty and Zharnel Hughes) have had their medals taken away.
In a statement, Mr Ujah said: “I accept the decision issued by the Court of Arbitration for Sport [CAS] today with sadness.
“I would like to make it clear that I unknowingly consumed a contaminated supplement and this was the reason why an anti-doping rule violation occurred at the Tokyo Olympic Games.
“I sincerely regret that this has inadvertently led to the forfeiture of the men’s 4 x 100m relay team’s Olympic silver medals at the Tokyo Olympic Games.
“I would like to apologise to my teammates, their families and support teams for the impact which this has had on them.
“I’m sorry that this situation has cost my teammates the medals they worked so hard and so long for, and which they richly deserved.
“That is something I will regret for the rest of my life.
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“Now that the IOC [International Olympic Committee]’s proceedings have concluded before CAS, my focus is on the forthcoming proceedings before World Athletics and I will therefore not be making any further comment until those separate proceedings have concluded.”
The Italian team took gold in the men’s 4 x 100m relay race at Tokyo 2020, with third place Canada being bumped up to bronze and China moving up from fourth place to take bronze.