In a surprising twist, the over-the-counter spray that led to world No. 1 tennis player Jannik Sinner failing two drug tests earlier this year displays “DOPING” on its packaging.

The Italian-sold spray, Trofodermin, contains the banned anabolic steroid clostebol. Despite this, Sinner has been cleared to compete and will face Jack Draper in the U.S. Open semifinals.

Trofodermin, commonly used to treat cuts and scrapes, was purchased by Sinner’s physical trainer in Italy.

It was during a massage from his physiotherapist, who had used the spray on his hand, that a trace amount of clostebol ended up in Sinner’s system.

Sinner, who has since parted ways with both his trainer and physiotherapist, insists he’s always adhered to anti-doping regulations.

Italian lawyer Giovanni Fontana, who has handled numerous doping cases, said clostebol positives often trace back to Trofodermin.

His concern is that the “DOPING” label appears only on the box, not the product itself, meaning the warning could easily be missed.

According to Italian law, products containing banned substances must carry a warning, but the risk remains if packaging is discarded.

Sinner, though cleared of intentional wrongdoing, has dealt with a significant hit to his reputation as he prepares for his next match.

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