Reigning MotoGP World Champion Casey Stoner has revealed the pain in his injured ankle is getting worse not better but he is determined to ride through it at this weekend's Phillip Island round.

The Aussie, who came back to racing at Motegi, said today that the injury is really causing him problems when he finishes a session and that it has grown steadily worse since his comeback ride in Japan.

"It has been swelling up again. I have a lot more pain in it every time I walk, no matter what I do I have pain. In the past, I have been able to put weight on it but since I have been racing in Japan, day by day it has been getting a little bit worse," said Stoner, speaking at Phillip Island.

"It was recommended that I stay off it for a while and only put light weight on it but, unfortunately, I have to put quite a lot of weight on it and I have to get it used to this before I get on a bike then when I am on the bike I am not worried out it.

"By the time a session has finished, it is giving me a lot of problems. When I am on the bike I am sure I will deal with it it's just mainly off the bike when the pain is worse.

"Therapy doesn't really help. The only kind of help is to try and get a little bit more movement. We've got a certain amount but we're struggling to get any more at this point because we have to wait for everything to heal inside."