MotoGP title contender Valentino Rossi is being treated for a suspected broken leg, following an enduro training accident.

According to Gazzetta dello Sport , the Italian star suffered a 'suspected fracture of the tibia and fibula' and should undergo surgery tonight.

If confirmed, such an injury would see Rossi miss his home Misano event next weekend and deal a massive blow to his 2017 title hopes.

The Movistar Yamaha rider is currently fourth in the standings, 26-points from Ducati's Andrea Dovizioso, with six rounds remaining.

Rossi has not been seriously injured since breaking his leg (a displaced and exposed fracture of his right tibia) during practice for the 2010 Italian Grand Prix at Mugello. On that occasion, it took Rossi six weeks to return to MotoGP action.

The #46 was also injured just before this year's Mugello round, while training on a motocross bike. The Italian spent a night in hospital after hurting his stomach and chest when he went over the handlebars on the landing of a jump, but did not sustain any fractures and was able to finish fourth in the grand prix.

UPDATE: