Wallaby captain George Gregan is confident he'll recover from a broken leg in time to play in Australia's first rugby international of the year against Samoa in June.

Gregan, the Australian and ACT Brumbies halfback, will miss the rest of the regular Super 12 season after breaking his leg in the second half of Saturday's 10-6 loss to the NSW Waratahs.

The 100 Test veteran said he was confident he could recover in time for the first Test against Samoa in Sydney on June 11.

"I hope so, it's just you can't 100 per cent say how your bones are going to heal - some people a bit quicker and some people a bit slower than others," he told Fox Sports.

"But that's the prognosis from the doctor and specialist with this type of injury - four to six weeks - and we'll just see how I respond.

"The first 48 hours have been pretty good, not much swelling and not too much pain.

"So hopefully that's a good sign.

"I've just got to wait for it to heal and progressively increase the load so I can get back in training as quickly as possible."

Gregan said he didn't initially think the injury was that bad when he collected an accidental knee from Waratahs' counterpart Chris Whitaker in the second half.

"I thought it was just a cork really and I thought I could run it out," he said.

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