The former MotoGP world champion Nicky Hayden has broken two ribs and a shoulder blade during a training accident in Kentucky.
The American suffered the injuries near his home in Owensboro and has since had x-rays, a CAT scan and an MRI.
Ducati confirmed that no surgery has been scheduled but that the 30-year-old rider will have the fractures assessed in California next week.
Nicky Hayden has won three grand prixs in his career - USA 2005 & 2006 and the Netherlands in 2006
Hayden, who became MotoGP world champion in 2006, had been training for the first time since breaking a wrist during the valencia Grand Prix in November.
The first race of the new season will take place in Qatar on April 8th.