This has been a long season for Brook, who was England's only ever-present across both June's T20 World Cup and their six home Tests. He spent the three weeks between the West Indies and Sri Lanka series captaining Northern Superchargers in the Hundred, and will fly to Pakistan for October's Test tour only three days after the fifth and final ODI of the Australia series.

Brook seemed characteristically relaxed on the eve of his England captaincy debut at Trent Bridge, grinning through his pre-match press conference and laughing off the idea that he had ever craved leadership. He conceded that his Test summer had not quite gone to plan, but played down the suggestion that he was mentally drained after an intense season.

"Because I wasn't scoring the runs I wanted to, I probably was [feeling] a little bit [tired]," Brook said. "But if I'd have gone out and got two hundreds against Sri Lanka then I'd have been like, 'I'll just carry on'. But no, not really. I love playing cricket: I want to play as much as I possibly can. I do think breaks are important at certain times, but I was pretty chilled.

"Obviously I didn't do as well as I'd wanted. I want to get a hundred every innings, but it's not going to happen, is it? Professional sport is not easy I felt like I batted really well against West Indies and then didn't play as well as I wanted to against Sri Lanka, but those things happen. You go away and think about it for a little bit, and hopefully come back stronger in Pakistan."

He will aim to keep things simple against Australia, batting at No. 4. "I'm just going to go out there and watch the ball as closely as possible," he said. "If you have a few low scores here and there, you start thinking about different things and your technique and whatever. I'm just going to go out there, watch the ball as closely as I can and play on instinct."

Buttler has challenged Brook to "identify those moments" in the field where he can change the game - something that Buttler himself has struggled with in ODIs. Brook showed signs of that instinct during the Hundred, and said that he would liberate his bowlers to make decisions: "Whatever you feel like doing, just do it. The only bad outcome is you could get hit for a boundary and the next ball could be a dot ball."

Brook said that he has hardly spoken to McCullum, who has instead delegated responsibility to his Test assistant coach Marcus Trescothick. "It's all going to merge into one at some point," Brook predicted. "We want to go out there and entertain the crowd, take the game on, try to take wickets and put the pressure on their bowlers."

And after ending the Test summer on autopilot at The Oval, Brook hopes that this new challenge will prove reinvigorating. "I've only been here for two days, but the way the lads have gone about their business in training just seems so chilled at the minute. We're all looking forward to going out there and having some fun."