Nick Kyrgios, Denis Shapovalov and Liam Broady were among the stars to post on social media on Tuesday after the Italian was cleared by an independent tribunal.
An initial test occurred during the Indian Wells tournament in March where Sinner reached the semi-finals and a further sample, conducted out of competition eight days later, also tested positive for the same substance.
Anti-doping body the International Tennis Integrity Agency [ITIA] confirmed Sinner had appealed the results on the basis the substance was accidentally transferred by his physiotherapist.
The Italian will still lose his 400 rankings points from Indian Wells, where the first test took place, as well as his $325,000 prize money.
But rival players have expressed dissatisfaction over the outcome, with Kyrgios describing the situation as “ridiculous”.
He posted on X: “Whether it was accidental or planned. You get tested twice with a banned (steroid) substance.
you should be gone for 2 years. Your performance was enhanced.”
British player Broady said: “Whether Sinner was doping or not, this is not right.
Plenty of players go through the same thing and have to wait months or YEARS for their innocence to be declared. Not a good look.”
Canadian star Shapovalov posted: “Can’t imagine what every other player that got banned for contaminated substances is feeling right now… different rules for different players.”
