Umberto Ferrara, Jannik Sinner’s trainer during doping case, says he warned of clostebol risks
“I very clearly communicated both the nature of the product, and that it must not come into contact with Jannik," Ferrara told Gazzetta.
https://www.nytimes.com/athletic/6252296/2025/04/04/umberto-ferrara-jannik-sinner-positive-test-clostebol/
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