Cate Campbell has bitten her tongue and refused to criticise Sun Yang after reports the controversial Chinese star will be free to swim at next month's world titles in South Korea.
Three-time Olympic champion Sun will reportedly contest the world titles at Gwangju because of a delay in setting a date for his latest doping case.
Sun - who served a secret three month doping ban in 2014 - faces a lifetime ban after allegations a vial of his blood was smashed by a hammer during a clash with testers in China last year.
Reports claimed Sun objected to an out-of-competition test at his Zhejiang home last September and it was alleged his mother ordered security guards to destroy a vial of the swimmer's blood that had been taken.
World body FINA decided not to reprimand Sun amid claims the testers had not shown adequate identification but World Anti-Doping Agency lodged an appeal.
However, Sun will reportedly still compete at the world titles starting on July 12 with his Court of Arbitration for Sport tribunal date yet to be finalised.
Campbell had been a vocal critic of Sun, angrily responding to news that the Chinese star was free to contest the lucrative FINA Champions Swim Series that concluded earlier this month.
"It raises some really serious questions that demand answers if WADA and FINA want to remain credible in the world of clean sport ... especially where it pertains to Sun Yang," Campbell told reporters at April's national titles.
But she resisted taking aim at the Chinese star as she prepared for her own world titles campaign.
"It is what it is. For me it's nothing but a distraction," she said at the world titles trials in Brisbane.
"I have to focus on doing what I do within the system that is currently in place, it is too late to change anything now."
Australia's Jack McLoughlin - who will potentially line up against Sun in the 400m, 800m and 1500m freestyle - didn't seem fazed by the Chinese star's world titles availability.
"I have got no say in it but I look forward to racing him. I want to race the best in the world and he is one of the best," Pan Pacs 400m champion McLoughlin said.
"Whoever steps on the blocks, it is not going to affect me and the way I race."
Australian Associated Press