Australia coach Andrew McDonald said on Friday that Cummins would likely need a minimum of four weeks of bowling preparation to have any chance of featuring in the first Test.
Cummins agreed, saying: “You’d want at least probably a month in the nets.
“If you play a Test match, you want to make sure you’re right to bowl 20 overs in a day and you don’t have to really think about it.
“So four weeks is pretty tight. But I think somewhere around that mark.”
Given Cummins’ timeframe, there is also no guarantee he will be fit for the second Test in Brisbane on 4 December.
“The first step is trying to kind of give me a shot at being right, and then we’ll work it out,” said Cummins.
Should Cummins miss the first Test, former skipper Steve Smith is likely to captain the side – with Scott Boland stepping in for Cummins in attack.
Australia have held the urn since 2018, while England are without a Test win down under since 2011.
England have their own doubts over captain Ben Stokes, who has been troubled with a shoulder injury since the Test series against India.
Warner says Australia’s chances of winning the series would improve if they avoid antagonising Stokes.
“I had the fortunate privilege to share a change room with him when he was younger and he has evolved into a serious cricketer and a fantastic leader,” he said.
“If we can sort of not poke that bear and get him up and about, I think that will help the Australians enormously.”
