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