The English team has opted for a twelve-player selection just two days before the opening Test match, with the 22-year-old spinner securing a surprise spot.
Bashir's selection indicates that the visiting team will delay until the day of the first Test to determine whether Perth Stadium conditions favor a pace-heavy attack or the inclusion of a spin bowler.
Jofra Archer and Mark Wood are included in the 12-man squad, indicating there are no doubts about either fast bowler's condition.
Gus Atkinson and Brydon Carse complete the attack, with the latter expected to miss out if Bashir makes the starting XI.
The England coach had been expected to choose an all-seam attack on a venue that has hosted five previous Tests.
During these games, 134 wickets have been taken by pace bowling, with only a small number to spin.
Of those spin dismissals, Australiaâs Nathan Lyon has claimed the bulk, while all visiting spinners combined have only eight.
On a ground renowned for its pace and bounce, and whose curator, Isaac McDonald, pledged that these characteristics are âa mainstay and not going to change,â a team loaded with seamers is still the more likely choice.
There had been rumors that the all-rounder could be parachuted into the side to provide some slow bowling while additionally strengthening the lower order.
But McCullum has opted to stick with Bashir, having stated earlier this year that he would be his first-choice slow bowler for the Ashes.
In July, Lyon described the English spinner as âdecent,â saying that âin my eyes, the experienced spinner is still Englandâs best spinner.â
âIt is a huge responsibility, and it can be a massive challenge for people who havenât done it in the past in these conditions,â Lyon remarked of slow bowling in Australian Tests.
âI won't let my secrets out so they come out and excel out here.â
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