He aims to be back in time for his home race in Australia - where he has won for the last five years - on 28 October and revealed that his recovery is going well.
He said: "The ligaments are healing as well as they can be.
Casey Stoner downbeat on MotoGP return after breaking ankle
"We had a fantastic surgeon, he's done a great job with very small scars, so healing time's going to be minimal, but unfortunately with what I've done we've really got to keep some weight off it and try and let it heal before I get back on a bike.
"I think it's going to be tough to make it six in a row at Phillip Island, but we'll definitely be there, even if they have to duck-tape me to the bike.
"I'll definitely be lining up for that one. I'm hoping to get back for a couple before that, but we'll see how things go and cross the fingers we can be back there."
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