Pope (left) averages 39.01 with eight centuries since McCullum and captain Ben Stokes took charge of England in 2022
England have yet to decide on the 11 players who will play in the first Ashes Test against Australia, says coach Brendon McCullum.
The series begins in Perth on 21 November and England are expected to have a largely settled team.
One of the few positions in doubt is number three, with the selectors having to decide whether to retain vice-captain Ollie Pope or opt for 21-year-old Jacob Bethell.
The young left-hander scored his first professional century in Sunday's third one-day international against South Africa.
