Cricket Australia chief executive Todd Greenberg has ruled out reopening the investigation into the 2018 ball-tampering scandal, maintaining that the board remains "comfortable with the outcome" despite Usman Khawaja's claims that the entire Australian team was aware of the use of sandpaper during that tour of South Africa.

Greenberg's comments, his first on the matter since Khawaja's revelations, follow David Warner's public backing of his former teammate's account, which he termed "100 percent accurate" while describing the board's original investigation as "rushed and botched".

Khawaja's version, which he elaborates on in his autobiography Sabr, claims to contradict a joint statement issued in 2021 by Pat Cummins, Mitchell Starc, Josh Hazlewood and Nathan Lyon, in which the four bowlers denied any knowledge of the ball being tampered with. He had also expressed his shock at never being interviewed by Cricket Australia despite sitting next to Cameron Bancroft through the Cape Town Test.

"I haven't read the book yet. Clearly it is out, but I'll hopefully get an opportunity to do it, but Usman was good enough to let me know some months ago that he would be releasing a book, and I really appreciated that call," Greenberg told SEN.

"First and foremost, I have huge respect for Usman to give his version of events," he added. "I read his comments over the weekend in the media, exactly the same time as the public and I'll obviously get to read his book at some point.

"But there are specific details in his book that contradict the versions that have been provided by others. And I want to be really careful to consider what Usman's actually said, and not respond to the headlines or the subsequent commentary that gets created.

"It's important to attribute his words and not the headlines. It's important to know that back at that time, players were urged to come forward, and they had the opportunity to do so over these past eight years, and that remains the case."

The investigation that followed the Cape Town Test resulted in 12-month bans for Steve Smith and Warner, then captain and vice-captain, and a nine-month ban for Bancroft. Greenberg said that nothing in Khawaja's account had altered the board's view of that process.

"We have said we're comfortable with the outcome of the investigation based on the information we've received. That includes what we've seen from Usman, and our position hasn't changed on that," he said.

"We don't see any compelling reason to open the investigation or revisit this again. I don't think there's anything that can be gained from that."

Warner had called for those responsible for the investigation to provide accountability, but Greenberg questioned what revisiting it would achieve.

"You end up at the same intersection where one person's version of events contradict the others, and I'm not sure what outcome people are searching for," he said.

"I think what people want is a single outcome that everyone is aligned up on, but I don't think that's possible on this occasion because we have such conflicting views from the same moment in time."