Melbourne - Australia's Ryan Harris has broken his left ankle and is expected to require surgery, the team said on Tuesday, after the paceman hobbled out of the field during the first session of the fourth Ashes Test in Melbourne.
Harris, who took nine wickets in the second Test in Perth but was wicketless for 91 runs in Melbourne, stumbled on an aborted run-up when bowling to England's Tim Bresnan at the Melbourne Cricket Ground.
The 31-year-old sat down by the wicket and surveyed his foot for a few moments before limping off the field.
"Ryan Harris developed ankle pain during England's first innings and scans have revealed a stress fracture of his left ankle," Cricket Australia doctor Trefor James said in a statement.
"Ryan is likely to require surgery and will consult a specialist in the next 24 hours."
A decision on whether Harris would bat in Australia's second innings would be made in due course, the statement added.
Harris was equal second in Australia's wicket-takers, sharing 11 wickets with Mitchell Johnson. Peter Siddle, who took six in England's first innings of 513 in Melbourne has 13.
Australia were set a 415-run target to force England to bat again with more than 2-1/2 days to play but began their chase disastrously when Shane Watson ran opening partner Phillip Hughes out for 23.
The five-Test series is level at 1-1, but victory in Melbourne will see England take the Ashes home for the first time in 24 years.