England’s search for a new Test coach is already under way, and Gould explained on Sunday a coach will be appointed before a new captain is finalised.

Gould also suggested that the captaincy would be split, perhaps hinting that white-ball captain Brook, also the Test vice-captain, would not be able to lead across all formats.

Brook and McCullum have formed a strong bond while working together with the white-ball teams, and England’s T20 side have just moved to the top of the world rankings.

It raises the question as to whether that partnership will be broken up if 27-year-old Brook takes control of the Test side.

“You know my thoughts on Harry, my affection for him as a player, person and leader,” said McCullum.

“He’s got one of the best tactical brains I’ve seen in someone so relatively young. He’s developing at an incredible speed as a leader. I love working with Harry and I’d love to continue to do so.

“There will be lots of robust conversations throughout. Myself with the white-ball and whoever takes over the red-ball, ultimately there’s going to be harmony across all three teams because we’re going to want what’s best for English cricket.”

McCullum previously had experience working in an environment where the coaching responsibilities were split. For two years, he was Test coach, with Matthew Mott in charge of the white-ball teams. When Mott was sacked in 2024, McCullum assumed overall control.

A heavily congested schedule lends itself to splitting the coaching jobs, but can also lead to one team being sidelined in terms of access to multi-format players.

McCullum will now have to build a working relationship with the new Test coach.

Former England coach Andy Flower could be a candidate, while McCullum’s former New Zealand team-mate Stephen Fleming is highly respected and has just left Indian Premier League side Chennai Super Kings.

Ex-England batter Jonathan Trott has international experience with Afghanistan and Glamorgan coach Richard Dawson is seen as an emerging homegrown contender.

“Once the Test coach is put in the post, we’ll work collaboratively to try to work out what is right for all three formats, and what is right for English cricket,” said McCullum.

“I expect that to be robust, but hopefully a profitable conversation for everyone. Fundamentally, we just need to get what’s right for English cricket. That will be the number one motivation.”

England, under McCullum, begin a three-match one-day series against India at Edgbaston on Tuesday.

Jos Buttler will play his 200th ODI for England, while the tourists can call on the likes of Virat Kohli, Rohit Sharma and Jasprit Bumrah.