Chiller said the letter outlined "the instances where we felt it could be perceived he had brought himself or the sport into disrepute and his was 16 pages long".

"We didn't unfairly target anyone. Anyone who makes a disclosure in their team membership agreement, which Nick did and other athletes and other officials have also done, they're treated consistently, they're treated fairly. Other athletes received exactly the same letter that Nick Kyrgios did."

"He received a letter on the 30th of May, on Monday last week, asking him to basically please explain, to explain his side of the story. So we had reached out to get that from him. He chose to not respond to that and to withdraw. So, ultimately, it's his decision.

"I was surprised actually because, contrary to what was in his statement, we had reached out to him," Chiller said.

A defiant Chiller rejected accusations Kyrgios had been targeted, said she had received support from across Australian sport for her stance on athlete behaviour generally and suggested Kyrgios would regret excluding himself from contention.

"I'm disappointed when any athlete doesn't understand what it means to be an Olympian," she said.

"I think it's something that in later years, if he doesn't get the opportunity to go to another Games, that he will very much regret it. I'm disappointed that an athlete of clearly so much talent and so much potential – you know, he is an incredible tennis player – I would love to see someone like that playing with the Australian Olympic crest on them. But I would also want that athlete to understand what it means and to respect the values of that being an Olympian means.

"Someone needs to stand up. Why I'm doing this is, we fought long and hard for the last three years to establish a set of behaviours for our team in Rio. There were comments after London that we didn't do that as well as we could. And we've worked really hard. And it's resonated with the athletes. The support that I've had from athletes and from team leaders and from sports has been incredible. I'm doing this for the 428 other athletes that we will have in Rio."

Chiller said that if Kyrgios changed his mind, he would have until June 17 to respond to the letter, as originally specified. The AOC executive would then "determine whether indeed he had brought himself, the sport or the Olympic movement into disrepute". Flanagan and Diamond face the same procedure, she said.

Meanwhile, Chiller said she respected golfer Jason Day's decision to miss the Games.