Injured reigning MotoGP champion Casey Stoner fears this weekend's Brno round could be even harder for him physically than Indianapolis.

Stoner sustained numerous right ankle injuries - including torn ligaments and small fractures to his ankle, tibia and fibula - during a huge qualifying highside.

The Repsol Honda rider bravely returned on Sunday where he rose as high as third in the race, before his weakened physical state allowed Andrea Dovizioso to seize the final podium position.

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Stoner, who has now slipped 39 points from titler leader Jorge Lorenzo, now has just days to recover before Friday practice in the Czech Republic.

It remains to be confirmed if Stoner will require surgery, with his medical team in Australia are currently reviewing the results of the MRI scan.

"I'm not feeling too optimistic for Brno after a tough weekend in Indy," said Stoner, who will retire at the end of this season.

"The crash in qualifying last week has left me with a serious problem in my ankle and we were fortunate that Indy was a left hand circuit, so a lot of the weight was off it but we still had changes of direction which hurt a lot.

"In Brno there are many changes in direction and a lot of right hand corners so there will be a lot of weight on my ankle and it's going to be very difficult.

"It's a shame as Brno is a circuit that I usually enjoy due to it's fast and flowing nature, so I'll be resting as much as possible this week and wait to see how we feel when we get on track on Friday".

Stoner won at Brno last season on his way to a second world title.

Repsol Honda will attend Monday's post-race test at Brno.