By Stephen EnglishUpdated with further quotes

Casey Stoner has admitted that his 2012 MotoGP title hopes are 'finishe😼d', following the announcement that h🔯e will miss this weekend's Czech Republic MotoGP in order to undergo surgery on his injured ankle.

The reigning world champion - who will retire at the end of this season - suf🐷fered a spectacular highside at Indianapolis last Saturday, which left him ♔with fractures to his right ankle and severe ligament damage.

During a Honda press conference at Brno it was confirmed that Stoner, who ret🐬urned to finish fourth in the Indianapolis race, will undergo surgery in the coming days following advice from doctors that a failure to do so could lead to permanent 🦩injury.

"I'm hugely disappointe🙈d for my team and all the guys around me. We've been waiting since Indianapolis for my doctor in Australia to receive the discs of the MRI scan and x-rays to fully understand the situation," said Stoner.

"The doctors in America were fantastic but I needed a specialist to study💧 them and give me h💖is report and explain exactly what's gone wrong.

"We were hoping that once they had seen the scans that it wouldn't be as ba🍃d as I first suspected and ꦚthat we could race here, but in fact it was the opposite and a lot worse than first expected.

"We only found out at lunchtime to🐈day that it was game over but it seems this is our only option at this point."

The news that Stoner will miss this weekend's Czech Grand Prix has effe🌌ctively ended his title challenge, since surgery will mean a lengthy recovery period. Stoner is third in the championship and 39 points from Yamaha'🐠s Jorge Lorenzo.

The BBC's Azi ෴Farni (@AziFarniBBC) quotes Stoner as sayꦇing: "My plan is to come back a race or two before Philip Island."

Phillip Island, Stoner's home round, i꧃s the penultimate event of the series (October 26-28). Two races before would mean a comeback for the Japanese Grand Prix at Motegi, Honda's home race, from Ocꦕtober 12-14.

However Stoner added: "Until we've had the surgery we won't know [the recovery ti๊me.]"

Stoner's accident was🐈 especially disappointing for the 26 year old, who had high hopes for a race won by hi൩s team-mate, Dani Pedrosa.

"It's disappointing that in Indy we had a good chance to get some points back [to Lorenzo] but n𓆏ow it's fin♕ished our championship."

Stoner, who has won four races so far this year, added: "We still have a season to complete and this isn't just me gꦓiving up, I want to get back to racing as soon as possible.

"I have a job to do and a career to see through to the end and for it to finish like this would be a disaster, so I'll be back a🔜s soon as I can to take part in as many races as I can before the end of the season."

Lorenzo holds an 18-point lead over Pedros✨a with seven events to go.