Two-time MotoGP World Champion Casey Stoner has said he hasn't totally closed the door on a return to the premier class but things will have to dramatically change for it to happen.

The forthright Aussie has now officially signed to race V8s for 2013 in a Red Bull-backed Triple Eight Holden in the Dunlop Series but says that he might consider a return to two wheels if MotoGP alters.

"I had no intentions of going back to the sport. But if I see the sport changing dramatically, to the point that it is interesting, there is every chance. But the way I see it going, there is no chance," said Stoner.