Hayden, who broke a finger while playing in his first match of the season here this month, was set upon while jogging on Friday, the reports said.
Tests have revealed there was no ankle tendon or ligament damage.
Hayden said the wound, about five centimetres (two and a half inches) long, would remain open for several days to minimise the risk of infection before being stitched.
“It was a vicious attack,” Hayden told Brisbane’s Sunday Mail newspaper.
“I was out for a leisurely run. You are always a bit shocked by that sort of thing but I was more disappointed than anything.
“It just hasn’t been my week.”
Hayden was already out of cricket for a couple of weeks after breaking a finger taking a catch in last weekend’s Sheffield Shield match against Tasmania in Brisbane.
“The hand injury would have kept me out for longer than this one (gashed ankle) anyway,” said Hayden, who added there was no doubt surrounding his fitness for the first Test against England at the Gabba on November 23.