The English team has chosen a twelve-player squad just two days ahead of the first Ashes Test, with the 22-year-old spinner earning a surprise spot.
Bashir's inclusion indicates that the visiting team will wait until the morning of the initial match to decide whether Perth Stadium pitch favor four seamers or the addition of a spin bowler.
Jofra Archer and Mark Wood are part of the selected group, showing there are no concerns about their fast bowler's fitness.
Gus Atkinson and Brydon Carse round out the attack, with the latter most likely to miss out if Bashir makes the starting XI.
The England coach had been anticipated to opt for an pace-only lineup on a venue that has hosted several previous Tests.
In those matches, the majority of dismissals have been taken by seamers, with only a small number to spin bowling.
Of those 40 wickets, Australia’s Nathan Lyon has claimed 29, while overseas slow bowlers combined have just a handful.
At a venue known for its speed and carry, and whose groundsman, Isaac McDonald, stated that these characteristics are “a mainstay and not going to change,” a side loaded with fast bowlers is still the more likely choice.
There had been rumors that Will Jacks could be brought into the team to offer some spin while additionally strengthening the lower order.
However McCullum has chosen to keep faith with the young spinner, having said previously that he would be his first-choice slow bowler for the series.
In July, Nathan Lyon commented on Bashir as “decent,” saying that “from my perspective, Jack Leach is still England’s best spinner.”
“It is a massive role, and it can be a significant test for bowlers who lack experience in the previous in these conditions,” he remarked of slow bowling in Australian Tests.
“I won't let my secrets out so opponents come out and excel out here.”
Mira is a tech journalist and AI researcher with over a decade of experience covering emerging technologies and their societal impacts.