Kevin Pietersen did not fly out to Australia with the England squad on Wednesday night as he has been granted compassionate leave.
England's 17-man squad left from Heathrow, but Pietersen will not join up with them in Perth until Sunday, 27 October.
It is understood that the batsman has been given dispensation following the death of a friend.
England's first warm-up game is against Western Australia in Perth, the match beginning on 31 October.
Pietersen became England's highest-ever run-scorer in August, when the hosts beat Australia 3-0 to clinch the Ashes for the third successive series.