The pace bowler has claimed 309 Test scalps in 71 five-day games with an average of 22.10.
Australia's selection chief Bailey has declared that skipper Cummins will be a central figure in this winter's Ashes series.
There were concerns that the veteran bowler might sit out due to a ongoing back issue that remained unresolved.
Previous updates from the Australian camp suggested no official announcement had been made regarding his involvement, with the Test matches scheduled to begin on the 21st of November in the WACA.
The selector shared that Cummins is "building up" and was "optimistic" about the likelihood of taking part.
"We're aware that the window is narrowing and there are permutations around that, not just the back issue, but additional elements," the selector added.
"It's positive. We firmly believe that he's going to play a major part. Ideally from the opening match. Should that not happen, we'll adjust."
Past Concerns
The captain missed Australia's limited-overs series against India and New Zealand recently after examinations confirmed a lumbar bone stress.
Previous incidents include of back injuries, with recurrences in several earlier campaigns leading to absences from three Australian summers in a limited period.
He emphasized he would be bold in recovery efforts in his recovery plan to make the squad for the series.
Bailey noted that he did not know if he had started his bowling workouts as part of his recovery but acknowledged it was "getting tight" for him to be fit for the initial match.
Contingency Plans
Should Cummins not be fit, ex-skipper Smith will take over the captaincy.
Versatile player Green was recently pulled out from the ODI lineup for their one-day international series against India as a preventive step because of discomfort in his torso.
He labeled it as a "slight concern and stated that he's scheduled to appear in the state-level matches, so will be "well-prepared to deliver overs."
"We put so much time has gone into developing the strategy for him to take part for the first Test as an all-rounder," Bailey explained.
"Originally, he'd only feature in the initial matches regardless. His aggressive style the willow in shorter formats, if it causes any delay for another day, we just made the decision to adopt a safer strategy."
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