JANNIK SINNER’S coach has defended the world number one and suggested the investigation into his failed anti-doping tests led to his player missing the Olympic Games.

It was revealed on Tuesday that Sinner had failed two anti-doping tests in March but has been absolved of fault or negligence by the International Tennis Integrity Agency (ITIA).

The ITIA accepted Sinner’s explanation that the banned substance clostebol, an anabolic agent that can aid muscle growth, had accidentally entered his system via a product one of his team had used to treat a small wound.