Spaniard Jorge Lorenzo will miss MotoGP's opening pre-season test in Malaysia next month after fracturing his left wrist while training in Italy and undergoing surgery.
The triple world champion will ride for the works Repsol Honda team this season, alongside title holder and compatriot Marc Marquez, after switching from Ducati.
The Sepang test runs from February 6 to 8.
Honda said in a statement that Lorenzo, who hurt the same wrist in a fall in practice for the Thailand Grand Prix last October, broke his left scaphoid during training near Verona.
A titanium screw was inserted and the 31-year-old will remain in hospital for 24 hours.