Jos Buttler argues that the recent decision to relieve Brendon McCullum of his responsibilities as England's Test coach could actually improve the team’s chances in the upcoming Cricket World Cup, as the former New Zealand captain can now devote all of his attention to the limited‑overs format and the quest for the trophy next winter. McCullum’s tenure as the head of England’s red‑ball side came to an end in July, when the board announced that former New Zealand great Stephen Fleming would take over the Test job.

Despite stepping away from the longer format, McCullum retained control of the white‑ball set‑up, a role in which he has overseen a remarkable run this summer: eleven victories and only two defeats across the limited‑overs calendar. Those wins include series triumphs over both India and Sri Lanka, outcomes that have lifted England’s reputation in one‑day cricket after a period of decline that followed their 2019 World Cup triumph.

Buttler, who captained England during the ill‑fated defence of the 2023 title, believes that the split‑coaching arrangement has freed McCullum to concentrate his energy entirely on the 2027 World Cup in southern Africa. "He now has a single focus – the white ball," Buttler explained on his "For the Love of Cricket" podcast. "He could have kept both jobs, but when you split your time between Tests and limited‑overs, your attention is diluted.

Now he can put every ounce of his expertise into the ODI game, which is the format that will decide the World Cup." The former New Zealand skipper’s shift in duties means he no longer has to juggle the strategic and selection demands of a Test program, nor the long‑term development plans that accompany the five‑day version of the sport. Instead, his calendar is dominated by the 50‑over format, with the World Cup looming as a concrete target.

"It’s not that he couldn’t do both – he certainly has the credentials – but his time is now concentrated on a single, clear objective: how do we win the World Cup with this group of players?" Buttler said. He added that the proximity of the tournament makes the goal feel tangible. "Four months ago his remit was everything – Tests, ODIs, T20s – and now it’s narrowed down to a specific mission. That focus gives him the chance to fine‑tune every detail, from batting orders to field placements, and to build a cohesive unit that knows exactly what it is aiming for." England’s ODI performances have been inconsistent over the past few seasons, with a dip in form after the 2019 victory and a series of disappointing results in major tournaments.

However, the recent summer campaign has signalled a resurgence. The team’s eleven‑win haul, highlighted by series wins against two of the world’s strongest cricketing nations, suggests that the foundation is being rebuilt. Buttler believes that McCullum’s undivided attention could accelerate that progress, turning a promising start into a sustained push toward World Cup success.

The conversation about coaching focus also ties into the broader context of England’s preparation schedule. The team is set to face a demanding itinerary that includes a tri‑series in Pakistan and a high‑profile tour of Australia in November. Unfortunately for England, Buttler himself is currently sidelined with a hamstring injury that has already ruled him out of the Pakistan series and casts doubt on his availability for the Australian leg. If the veteran wicket‑keeper‑batsman misses the eight ODIs that comprise those tours, England could lose one of its most experienced one‑day players during a crucial pre‑World Cup period.

Buttler described his own situation with characteristic candour. "I’ve had a scan and I’m waiting for the specialist’s report. The uncertainty is the hardest part – every player wants a clear timetable, a date when the physio can say ‘you’ll be back on the field on this day.’ At the moment, we don’t have that certainty yet," he said.

The lack of a definitive recovery date adds another variable to England’s planning, but it also underscores the importance of having a coach who can concentrate fully on the tournament’s strategic demands. In summary, Buttler’s assessment is that McCullum’s departure from Test duties is a strategic advantage for England’s World Cup ambitions.

By shedding the responsibilities of the longer format, McCullum can devote his full intellectual and tactical resources to the white‑ball game, fine‑tuning the squad’s approach, and ensuring that the team peaks at the right moment. While injuries to key players like Buttler present challenges, the clarity of purpose that comes from a single‑focused coaching structure could be the catalyst England needs to recapture the glory of 2019 and lift the trophy again in 2027.