The 3 month suspension of World No. 1 tennis player, Jannik Sinner, for doping, following a negotiated settlement with WADA, is a timely reminder for athletes on two counts.

The first is the strict liability principle for positive doping tests.

Under the strict liability principle, an anti-doping rule violation occurs whenever a Prohibited Substance is found in an Athlete's bodily Specimen. The violation occurs whether or not the Athlete intentionally or unintentionally used a Prohibited Substance or was negligent or otherwise at fault.

The second is the importance of an athlete's circle of trust.

In a statement released on Saturday, WADA explained that it continues to believe Sinner did not intend to cheat but that he was responsible for his entourage's negligence.

The statement said: "WADA accepts the athlete's explanation for the cause of the violation as outlined in the first instance decision. WADA accepts that Mr. Sinner did not intend to cheat, and that his exposure to clostebol did not provide any performance-enhancing benefit and took place without his knowledge as the result of negligence of members of his entourage.

"However, under the Code and by virtue of CAS precedent, an athlete bears responsibility for the entourage's negligence. Based on the unique set of facts of this case, a three-month suspension is deemed to be an appropriate outcome."

Sinner will miss four ATP Masters 1000 events - Indian Wells and Miami in March, along with Monte-Carlo and Madrid in April. He will be eligible to return at his home event, the Masters 1000 in Rome on May 7.