Drugs in society Wellness Tennis See all topics Facebook Tweet Email Link Link Copied! Follow Jannik Sinner has reappointed fitness coach Umberto Ferrara to his coaching team having previously dropped Ferrara during Sinner’s recent doping suspension . Sinner served a three-month ban earlier this year after twice testing positive for banned substance Clostebol, an anabolic steroid, in March last year. The Italian previously escaped a ban when the International Tennis Integrity Agency (ITIA)

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