England remain confident Ajmal Shahzad will be fit for the World Cup despite the fast bowler suffering a hamstring tear.
The Yorkshireman suffered the injury in the 51-run defeat to Australia in Brisbane, with a scan revealing a low-grade tear.
And although the injury will rule Shahzad out of the remaining two games of the series, he is expected to be fine for the World Cup when it gets underway on February 21.
"Shahzad has suffered the type of minor hamstring tear that required at least eight days of rest, and as such he will be rested," an ECB spokeswoman said.
"He will remain with the England squad in Australia where he will be in the best place to begin his rehabilitation from the injury.
"The England team are remaining cautious with Tremlett (who is not a part of the World Cup squad) despite the scans showing no sign of a tear.
"The specialists will take another look at him in the coming days and make a further assessment before the final game of the series in Perth on Sunday."
Fellow quickie Chris Tremlett will also miss the sixth ODI in Sydney after suffering a side strain, although the Surrey man could be okay for the series finale.