Two-time Olympic finalist Erriyon Knighton has been banned for four years in a doping case over an anabolic steroid that rules the 21-year-old American sprinter out of the 2028 Los Angeles Games.

The Court of Arbitration for Sport said on Friday its judges upheld separate appeals by the World Anti-Doping Agency and track and field investigators filed after Knighton was cleared by a tribunal in the US that accepted he was contaminated by eating meat.

WADA and the Athletics Integrity Unit argued the evidence that had been presented was statistically impossible and asked for a maximum four-year ban, the court said.

Knighton is the sixth-fastest man in track history over 200m, with a best time of 19.49 seconds. Only Noah Lyles and Michael Johnson are ahead of him among American sprinters.

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