Buttler rested, Bairstow called up
Although Buttler's glovework has continued to improve his batting has faded in the second part of the season against Australia. He made just 122 runs at 15.25 in the Ashes and fell for a third-ball duck at Lord's on Saturday, lbw to Glenn Maxwell. That followed a score of 4 at the Ageas Bowl when he drove loosely to mid-off.
Being England's wicketkeeper across all three formats since the middle of last year, when he was promoted to the Test side following Matt Prior's ultimately career-ending injury against India, has meant Buttler has had an extensive workload.
He missed the last one-day international against New Zealand and the T20 earlier this season, having sustained a finger injury, but has played 43 internationals since making his Test debut against India, at the Ageas Bowl, last July. Only Joe Root, with 44 appearances, has played more for England during that period and he has been granted a rest since the end of the Ashes.
Between the end of the Ashes and the start of the limited-overs leg against Australia Buttler appeared in the NatWest Blast finals day for Lancashire having also played the quarter-final between the fourth and fifth Tests. Barely 12 hours after picking up the trophy at Edgbaston, as Lancashire overcame Northamptonshire in the final, he was at a training session in Cardiff ahead of the T20 international.
Trevor Bayliss, the England coach, said: "While we initially felt Jos would have enough left in the tank for this ODI series, it has become clear in the last couple of days that he will benefit from a break from cricket ahead of the winter tours. We know that for players involved in all formats finding periods throughout the year when they can rest is key and Jos has had a heavy workload throughout 2015.
"Resting players provide opportunities for others in the international arena and Jonny Bairstow now has a chance to build on the one day form he showed at the end of the New Zealand series earlier this summer."
Bairstow was unlucky to be omitted from the original one-day squad having made a matchwinning, unbeaten 83 against New Zealand, at Chester-le-Street, in June on his recall. He was then also recalled to the Test team during the Ashes at the expense of Yorkshire team-mate Gary Ballance although did not completely convince at No.5.
England already had Sam Billings, the Kent wicketkeeper-batsman, in the squad but do not yet view him as an option for the gloves and have left him out of the first two matches against Australia after he played the series against New Zealand and the T20 against Australia as a batsman.
While Bairstow's call-up to replace Buttler means at least one change to the England side for the third match at Old Trafford on Tuesday they will have to consider further alternative options as they try to keep the series alive having gone 2-0 down at Lord's.
David Willey and Reece Topley, the left-armers, will come into the equation to provide the bowling attack with some variety.
Andrew McGlashan is a deputy editor at ESPNcricinfo