Eoin Morgan looks set to be sidelined for several weeks after breaking a right finger during England's Champions Trophy semi-final victory against South Africa.
The 26-year-old Middlesex and England batsman had tried to play through the pain but will now have an operation on the finger on Friday.
He pulled out of Thursday's second Twenty20 international against New Zealand, which was abandoned as a draw after just two balls were bowled because of rain.
Morgan, who has scored 2,899 runs in one-day international cricket, has also played in 16 Tests for England and has a batting average of more than 30.
Spinner James Tredwell captained the England T20 side for Thursday's match at The Oval because of Morgan's unavailability.
Tredwell lost the toss and the Black Caps asked England to bat, but after Michael Lumb was dismissed with the second ball of the innings, steady drizzle forced the players off the pitch and no more play was possible.
It was an unfortunate turn of events for Kevin Pietersen who was unable to bat in the match. It was his first England appearance since March as he has been recovering from a knee injury.
He had scored a brilliant unbeaten 177 for Surrey in the recent County Championship match against Yorkshire and will join up with the England squad for a warm-up match against Essex, which starts on Sunday.
England are 1/1 to win the first Ashes Test, which is scheduled to start on 10th July, while Australia can be backed at 1/1 to take a 1-0 lead in the series, and the draw is available at 1/1.
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