Nick Kyrgios says the high-profile doping cases involving Grand Slam winners Jannik Sinner and Iga Swiatek are "disgusting" for tennis.

Nick Kyrgios said the recent doping incidents involving Jannik Sinner and Iga Swiatek were “disgusting” for the sport, as the Australian slammed authorities over what he saw as lenient treatment in their cases.

Nick Kyrgios has said the doping charges against Jannik Sinner and Iga Swiatek are “disgusting for our sport” as he prepares to make his long-awaited return to tennis.

Nick Kyrgios said the recent doping incidents involving Jannik Sinner and Iga Swiatek were "disgusting" for the sport, as the Australian slammed authorities on Saturday over what he saw as lenient treatment in their cases.

Just days away from his return to tennis at the Brisbane International, Nick Kyrgios hasn’t minced his words in referring to doping-related charges against Jannik Sinner and Iga Swiatek

The tennis integrity right now, and everyone knows it, but no one wants to speak about it, is awful. It's not okay,' the Australian player said.

As Jannik Sinner and Iga Swiatek prepare for the new season after a year in which they fell foul of doping rules, positive drug tests due to contamination are a genuine fear for many of their fellow professionals.

Nick Kyrgios has launched a savage attack on tennis stars Jannik Sinner and Iga Swiatek for breaches of the sport's anti-doping program, labelling their conduct as "disgusting for our sport".