England's white-ball captain, Jos Buttler, is ruled out of the upcoming three-match T20 series against Australia due to a calf injury and is doubtful for the subsequent five-match ODI series. Phil Salt will lead the T20 team in Buttler's absence, while Harry Brook is a potential captain for the ODI series if Buttler does not recover in time. Jamie Overton has been called up to replace Buttler in the T20 squad, and Jordan Cox has been included in the ODI squad as cover. Despite Buttler's setback, England remains optimistic about his recovery and potential participation in the series. The T20 series starts on September 11, followed by the ODIs from September 19 to 29.