Australian MotoGP rider Jack Miller will miss this month's Japanese Grand Prix at Motegi after breaking his right leg in a training accident, his Marc VDS Honda team said on Monday.

Miller fractured the top of the tibia when he put his foot down to prevent a slow-speed crash while training on a trials bike near his European base in Andorra last Friday, the team said in a statement.

The 22-year-old Queenslander, who is leaving the Belgium-based team for Pramac Ducati at the end of the season, had surgery in Barcelona on Saturday to insert a plate and eight screws.

"Miller already has some mobility in the injured leg, but will head back to Andorra today to start an intense program of physiotherapy designed to get him back on the bike for the Australian Grand Prix," the non-works team added.

The Australian round at Phillip Island near Melbourne is on October 22, the weekend after Japan.

"Obviously I'm both disappointed and frustrated to have to sit out the Japanese Grand Prix through an injury sustained while training, especially as it wasn't even a crash," said Miller.

Miller, winner in the Netherlands last year but currently 12th in the championship, is the third rider to suffer injuries away from the racetrack in recent weeks.

Italian Valentino Rossi, a nine-time world champion, broke his right leg while training on an off-road bike at the end of August while Britain's Cal Crutchlow needed surgery after severing a tendon while cutting cheese at home.

Yamaha's Rossi returned to racing barely three weeks later, finishing fifth in Spain on September 24.