The pace bowler has taken 309 Test scalps in 71 Test matches with an stellar bowling average.
The Australian selection chief the selector has declared that skipper Cummins will have a crucial role in the upcoming historic rivalry.
There were concerns that the 32-year-old might miss the series due to a ongoing back issue that had not yet healed.
Initial reports from the squad suggested no definitive call had been made regarding his involvement, with the Test matches set to start on the 21st of November in Perth.
Bailey expressed that Cummins is "building up" and felt positive about the likelihood of taking part.
"It's clear that the clock is ticking and there are permutations involved, not only his injury, but other factors as well," the selector added.
"The outlook is good. There's strong faith that he's going to play a significant role. Hopefully starting in Perth. If not, then we'll pick it up."
Previous Setbacks
The captain missed Australia's limited-overs series against New Zealand and India recently after medical tests showed a lower back issue.
Previous incidents include of recurring issues, with flare-ups in several earlier campaigns causing him to miss three Australian summers in four years.
The bowler mentioned he would be bold in recovery efforts in his comeback strategy to ensure his availability for the contest.
The selector indicated that it was unclear if he had started his bowling workouts as part of his rehabilitation but acknowledged it was "becoming urgent" for him to be fit for the initial match.
Contingency Plans
In case of absence, former captain Steve Smith will lead the side.
Versatile player Green was withdrawn recently from the national team for their one-day international series against the subcontinent side as a safety move because of an abdominal issue.
The selector characterized it as a "minor" injury and confirmed that Green will play in the state-level matches, so will be "well-prepared to be ready to bowl."
"We put so much time has gone into creating the schedule for him to be available for the first Test as an dual-role player," Bailey explained.
"Originally, he'd only feature in the initial matches regardless. How he handles the bat in limited-overs, should it hinder progress for a short period, we just made the decision to approach this more conservatively."
Series Schedule
The Ashes: Australia v England
Spanning from late 2025 to early 2026
