Jannik Sinner, Clostebol, and the Three-Month Settlement

Timeline

1. Mar 2024Sinner returns two positive samples for low levels of clostebol, one in competition at Indian Wells on March 10 and one out of competition on March 18.
2. Apr 2024Sinner successfully appeals two provisional suspensions and keeps playing while the case proceeds confidentially.
3. Aug 20, 2024The ITIA announces an independent tribunal's finding of "no fault or negligence"; Sinner forfeits his Indian Wells points and prize money. He parts ways with his fitness trainer and physiotherapist.
4. Sep 2024WADA appeals to the Court of Arbitration for Sport, seeking a ban of one to two years.
5. Feb 15, 2025WADA announces a case-resolution agreement: a three-month suspension (February 9 to May 4, 2025), accepting that Sinner did not intend to cheat.
6. May 2025Sinner returns at the Italian Open in Rome.
7. Jul 2025Sinner rehires his former fitness trainer Umberto Ferrara.

The ethical issues

• Strict liability and the entourage: athletes are responsible for their team's negligence, even when they are personally blameless.
• Settlements vs. adjudication: WADA's negotiated outcome avoided a CAS hearing and was timed around the Grand Slam calendar.
• Equal treatment: lower-ranked players said they lacked the resources and confidentiality afforded Sinner.
• Transparency: provisional suspensions were lifted privately and the case became public only after the tribunal ruled.
• Proportionality: trace amounts of a substance with no plausible performance benefit vs. the deterrent value of sanctions.

Stakeholders

Stakeholder	Interests & obligations
Jannik Sinner	Career, reputation, and a fair process; responsibility for his team's conduct.
Sinner's support staff	Professional duty to know anti-doping rules; legal and reputational exposure.
Other players, especially lower-ranked	Equal treatment, transparency, and access to legal resources.
ITIA (International Tennis Integrity Agency)	Running a credible, consistent anti-doping program.
WADA	Upholding the Code's principle of entourage responsibility; the legitimacy of settlements.
Tournaments, sponsors, and fans	Trust in the sport's biggest star and in its integrity system.

The case

On August 20, 2024, days before the U.S. Open, the International Tennis Integrity Agency (ITIA) disclosed that world No. 1 Jannik Sinner had tested positive twice in March for clostebol, an anabolic steroid banned at all times.^[1][5] The concentrations were tiny, less than a billionth of a gram per milliliter. An independent tribunal had already heard the case in private and accepted Sinner’s explanation.^[2][5]

According to the tribunal’s findings, Sinner’s fitness trainer had bought Trofodermin, a spray sold over the counter in Italy for treating wounds, which contains clostebol. The trainer gave it to Sinner’s physiotherapist, who had a cut on his finger. The physiotherapist applied the spray to his hand and then gave Sinner daily massages without gloves. Sinner has a skin condition, psoriasiform dermatitis, that caused small cuts and sores on his feet and back during the tournament.^[7] Scientific experts said this was consistent with the trace levels found.^[1][2]

The tribunal’s decision, issued August 19, 2024, by a three-member panel chaired by David Sharpe KC, fills in the detail. The trainer had bought the spray at a pharmacy in Bologna in February. On March 3, the physiotherapist cut his little finger on a scalpel he used to treat calluses on Sinner’s feet. The first sample showed 121 picograms per milliliter of a clostebol metabolite (86 after adjusting for specific gravity), and the second 122 (76 adjusted). Three independent experts, two of whom did not know the player’s identity, agreed that contamination from the physiotherapist’s treatment could explain the results. The tribunal found as fact that Sinner did not know the trainer had the spray, did not know the physiotherapist was using it, and had no reason to suspect any anti-doping risk from his treatment.^[7] The tribunal found that Sinner bore “no fault or negligence.” He forfeited the ranking points and prize money from Indian Wells, where the in-competition sample was taken (400 points and $325,000), but received no suspension.^[2] He had been provisionally suspended twice in April, from April 4 to 5 and from April 17 to 20, and both times won an urgent application to lift the suspension^[7], so he played on while the case was handled confidentially.^[1] He dismissed both staff members.^[1]

Background

Clostebol has a dual identity. It is an anabolic steroid on WADA’s prohibited list, and a related compound, Oral Turinabol, was widely used in East Germany’s state doping program.^[2] But in Italy it is also an everyday medicine. Trofodermin, a spray and cream combining clostebol acetate with an antibiotic, is sold without prescription to help heal cuts, abrasions and burns.^[2] That availability helps explain why clostebol cases recur among Italian athletes. Athletes in several sports, including baseball and Italian soccer, have been suspended after testing positive for it.^[2]

Sinner’s samples were taken on March 10, 2024, in competition at Indian Wells, and on March 18, out of competition.^[7] At the time he was the dominant player in men’s tennis, having won his first Grand Slam title at the Australian Open in January. He became world No. 1 in June 2024, the first Italian to hold the top ranking.^[1]

The rules and governance

The World Anti-Doping Code imposes strict liability: the presence of a prohibited substance is a violation regardless of intent. The athlete’s degree of fault affects only the sanction.^[3] A finding of “no fault or negligence” removes any period of ineligibility, but the athlete still loses results from the competition where the sample was taken.^[2] WADA, as a party to the Code, can appeal any federation or tribunal decision to the Court of Arbitration for Sport.^[6]

Case resolution agreements allow WADA and an athlete to agree a sanction without a full hearing. WADA said they have long been part of the system and were formalized in the 2021 Code.^[3] Provisional suspensions after a positive test can be challenged, and the rules allowed Sinner’s successful challenges to remain confidential while the case was pending.^[1]

WADA appeals, then settles

The World Anti-Doping Agency did not dispute the explanation of how the substance got into his body. It disputed the conclusion that he bore no fault. In September 2024 it appealed to the Court of Arbitration for Sport, seeking a ban of one to two years.^[6] Its position rested on a core principle of the World Anti-Doping Code: athletes are responsible for the conduct of their entourage.

A CAS hearing was scheduled for April 2025. Before it took place, WADA announced on February 15, 2025 that it had entered a “case resolution agreement” with Sinner. He would serve a three-month suspension, from February 9 to May 4, 2025. WADA said it accepted that Sinner “did not intend to cheat,” that the exposure gave him no performance benefit, and that it had happened without his knowledge, but that “an athlete bears responsibility for the entourage’s negligence.”^[1][3] The timing meant Sinner missed no Grand Slam event. He returned in Rome in May, and later that summer won Wimbledon.^[1][4]

“Favouritism”?

The resolution drew sharp criticism from some players. Novak Djokovic said that “the majority of the players feel like there is favouritism happening,” pointing to the ability of top players to secure rapid, expert legal help.^[1]

Sinner’s defenders, including his lawyers, called much of the commentary ill-informed. They said the rules permit confidential appeals of provisional suspensions, that the case was decided on scientific evidence, and that the settlement was a mechanism available to any athlete.^[1] WADA said settlements are a long-standing tool formalized in the 2021 Code.^[3]

Aftermath

Sinner served his suspension from February 9 to May 4, 2025, and missed no Grand Slam event. He returned in Rome in May and won Wimbledon that summer.^[1][4] The arrangement remains disputed. WADA maintains that an athlete “bears responsibility for the entourage’s negligence” even without intent or performance benefit.^[3] Before the tribunal, Sinner had argued that he met his responsibility for his team by carefully selecting its members, imposing professional obligations on them, and stressing the importance of the anti-doping rules.^[7]

The core dilemma

An athlete appears to have been contaminated through no fault of his own, but by someone on his team. The anti-doping system needs athletes to take responsibility for their entourage, but it also needs to be fair to the blameless. Should Sinner have been suspended at all? Was a negotiated three-month ban a fair compromise, or a sign of a two-tier system?

Competing values

• Entourage responsibility vs. personal blamelessness: deterring careless teams vs. punishing an athlete for someone else’s mistake.
• Efficiency vs. transparency: settlements avoid costly hearings but happen behind closed doors.
• Equal treatment vs. individual circumstances: every case is fact-specific, but differing outcomes look like privilege.
• Scientific sensitivity vs. meaningful violations: ultra-sensitive testing catches trace contamination with no performance effect.

Strongest arguments

For a suspension: if athletes can escape any sanction by blaming their staff, teams will be careless and cheaters will hide behind them. A short ban acknowledges the absence of intent while preserving the principle.

Against a suspension (or for a longer one): if Sinner was blameless, punishing him was arbitrary, and timing it to avoid the majors suggests negotiation, not principle. Critics of the opposite view say a contamination defense accepted for the world No. 1 must be equally available to everyone, and that a public hearing would have served that better.

Applying the frameworks

Kantian (duty)

A Kantian lens asks whether it is right to punish a person who did not intend wrongdoing. Strict liability treats the athlete as responsible for their entourage, a duty they voluntarily accept. The lens is uneasy with punishing the innocent, but accepts that a public, consistently applied rule binding all athletes equally can be justified.

Justice

A justice lens focuses on consistency. If a top player can secure confidential handling and a well-timed settlement, while lower-ranked players face public provisional suspensions and longer bans, the system is not treating like cases alike. Defenders respond that the same rules and options are available to all; the challenge is making sure all athletes can actually use them.

Utilitarian

Consequentialists weigh the benefits of strict liability (deterrence, closing loopholes, administrative simplicity) against the cost of sanctioning athletes for trace contamination. As detection becomes more sensitive, the lens favors reforms such as minimum reporting levels for some substances, if they can be designed without opening new avenues for cheating.

Walk it through: the Simple Decision Model

1. Spot the issue. You are WADA’s general counsel in early 2025 deciding whether to settle the Sinner appeal before the CAS hearing. The stakeholders include Sinner, other players, clean athletes, the ITIA, tennis fans and the credibility of the anti-doping system. The code in play is the World Anti-Doping Code.
2. Gather facts. What does the scientific evidence show about intent and benefit? What sanctions have similar contamination cases received?
3. Test options. Options: (a) proceed to the hearing and seek one to two years; (b) settle on a short suspension; (c) withdraw the appeal. Weigh consistency and the principle of entourage responsibility against proportionality and cost.
4. Check codes and law. Are you influenced by the player’s profile or by public pressure? Would you settle on the same terms with a lower-ranked player?
5. Decide and document. Record the reasoning for the agreement and how it compares with precedent.
6. Communicate and follow up. Communicate the decision openly, explain why it is proportionate, and commit to reviewing rules on trace contamination.

What’s settled and what’s contested

• Settled: the two positive tests; the tribunal’s no-fault finding; WADA’s appeal; the three-month suspension served February 9 to May 4, 2025.
• Contested: whether settlement was the right mechanism; whether top players receive more favorable treatment; whether trace-level thresholds should exist.

Why this case matters

Sinner’s case shows that modern anti-doping is about managing the people and products around an athlete as much as the athlete. It also shows that negotiated justice needs visible rules to be trusted.

Key terms

Strict liability

The anti-doping principle that athletes are responsible for any prohibited substance in their bodies, whether or not they meant to take it.

Due process

Fair procedures before a sanction: notice, a chance to respond, an impartial decision-maker and a right of appeal.

Trust

The public’s belief that what they are watching is real. Integrity failures are ultimately failures of trust.

Codes and guardrails

Written rules of conduct, backed by real consequences, that turn values into expected behavior. Without enforcement they are decoration.

Definitions from the Ethics Cases glossary.

Discussion questions

1. If Sinner bore no personal fault, was any suspension justified? What does the principle of entourage responsibility achieve?
2. Should anti-doping cases be resolved by negotiated settlements, or only by full hearings? What are the advantages and risks of each?
3. Novak Djokovic and others said many players felt "favouritism" was at work. How should the system ensure equal treatment for players with fewer resources?
4. Should provisional suspensions and their appeals be public in real time? Whose interests does confidentiality serve?
5. Compare Sinner's case with Sharapova's. Which athlete's outcome seems more just, and why?

Sources

1. Jannik Sinner — Wikipedia
2. Clostebol — Wikipedia
3. WADA agrees to a case resolution agreement in the case of Jannik Sinner — World Anti-Doping Agency
4. Jannik Sinner: Tennis world number one's case 'million miles away from doping', says Wada general counsel — BBC Sport
5. Tennis star Jannik Sinner tested positive for a steroid twice but will not be suspended — CBC News
6. Sinner 'surprised' as Wada launches doping appeal — BBC Sport
7. ITIA v Jannik Sinner, SR/250/2024: Decision of the Independent Tribunal (19 August 2024) — International Tennis Integrity Agency