Australian tennis player Nik Kirjos said that the number one player in the world, Janik Siner, should have been suspended for two years, since he failed the doping test on two occasions.
Sinner was first tested during the Masters in Indian Wells in March and tested positive for the banned substance clostebol, and tested a second time eight days later, out of competition, when he also tested positive.
The independent commission found that Siner was not guilty, since traces of the banned substance were unintentionally transferred to him by a physiotherapist.
"Whether it was accidental or planned. You tested twice for a banned (steroid) substance... You should be out for two years. Your performance has improved," Kyrgios said on Twitter.
Sinner advanced to the semi-finals of Indian Wells, but it was decided that he would be stripped of 400 points and $325.000 in prize money.
British tennis player Liam Brodie said that "the situation does not look good".
"Whether Siner doped or not, this is not right. Many players go through the same thing and have to wait months or years to be declared innocent. This does not look good," he said.
Canadian Denis Shapovalov said that not all tennis players receive the same treatment.
"I can't imagine what every other tennis player who has been suspended for contaminated substances is feeling right now... Different rules for different players," Šapovalov added.
The product was said to contain less than a billionth of a gram of the banned substance clostebol, Sky reported.
In a statement from the Tennis Integrity Unit, it is stated that the physiotherapist treated his skin wound with a spray and that he did so between March 5 and 13, during which time he "provided massages and sports therapy to Siner on a daily basis, resulting in an unknown transdermal contamination".
The Association of Tennis Professionals (ATP) said it was "encouraged that no wrongdoing or negligence by Siner was found".
"We also want to acknowledge the robustness of the investigative process and independent assessment of the facts within the Tennis Anti-Doping Program, which allowed him to continue to compete," the statement reads.
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