Surgery on his injured neck appears to be on the cards for Wallabies prop Ben Darwin while skipper George Gregan's headache revolves around whether he'll continue his rugby Test career.

As Darwin fights to overcome painful headaches, braces himself for surgery and learns to live in a neck brace, Gregan is deciding whether he will stay on with the Wallabies.

The world's most capped halfback said he was yet to make a decision on whether he would continue his international rugby career but promised to make up his mind within the next few weeks.

And he said once he'd reached a decision he would let everyone know.

"No decision is made yet and when the decision is made it will certainly be made public, that's for sure," Gregan said.

"I'll make a decision on it in the next few weeks."

Darwin's future in the sport is dependent on the outcome of his neck injury and the 27-year-old refused to comment on his career until he had more information about his injury.

A terrified Darwin lost feeling in his limbs after a scrum buckled 10 minutes into the second half of Australia's 22-10 semi-final win over New Zealand.

X-rays and scans revealed a prolapsed disc which touched his spinal cord, sending it into temporary shock.

Darwin is continuing an endless barrage of tests at Royal North Shore Hospital but so far the prognosis has not been great.

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