Nick Kyrgios has hit out yet again at
Jannik Sinner, claiming there was no way he did not know about clostebol being in his system.
Sinner returned to professional tennis for the first time since the 2025 Australian Open in January at the 2025 Italian Open after serving the three-month suspension given to him by the World Anti-Doping Agency.
The world No. 1 had a great first tournament back,
losing to Carlos Alcaraz in the final. Millions of fans worldwide were happy to see him return to the
ATP Tour, but many others remain annoyed by how Sinner's case was handled.
Neither WADA nor the International Tennis Integrity Agency disputed Sinner's explanation that his physiotherapist, who used a product containing traces of clostebol given to him by Sinner's fitness coach, accidentally contaminated him at the 2024 Indian Wells Open.
However, Kyrgios has not believed that story from the start.
The Australian remains the most vocal critic of Sinner, repeatedly arguing that the three-time Grand Slam champion deserved a lengthier suspension.
Kyrgios' latest attack on Sinner occurred during an appearance on The Changeover Podcast. He dismissed the accepted story by the governing bodies about him being accidentally contaminated, and said the team members would not have been that careless.
"He's the number one in the world. Do you really believe he's going to hire a physiotherapist who carries a scalpel without a cover in his bag, accidentally cuts himself with it, and then gives him a massage without protection?"
"He pays hundreds of thousands of dollars to that person and puts all his trust in him. Tennis players like Sinner are super strict with everything and very professional, they don't even take a sip of alcohol, they take maximum care of themselves. Am I supposed to believe he knew nothing about the physio's situation? Come on."
Despite Kyrgios's certainty that Sinner's story is nonsense, no one can prove that for sure. The explanation not sounding plausible to him does not represent irrefutable evidence that Sinner deliberately used clostebol.
At the same time, Kyrgios is not the only person who finds the story strange. If true, Sinner's contamination was an extraordinary abdication of responsibility from physiotherapist Giacomo Naldi and fitness coach Umberto Ferrara, neither of whom works with the world's No. 1 anymore.
Last month,
Ferrara sensationally revealed that he knew the product he gave Naldi contained clostebol, but told him to keep it away from Sinner. Many had assumed Ferrara did not know the product had clostebol when offering it to Naldi.
Ferrara claims that he uses the product, named trofodermin, to manage a chronic disease. Nonetheless, the fitness coach admitting to having a harmful product to Sinner with him when travelling was startling.
Sinner's return to tennis does not change the case being among the most polarizing moments in tennis history. Many have embraced Kyrgios speaking out, while others believe it is simply sour grapes from a man who wasted his talent by being lazy and desperately seeks relevance.