Loris Capirossi has been forced to withdraw from his home Italian MotoGP after medical checks revealed rib fractures and a 'distorted' AC joint in his shoulder.

The Pramac Ducati rider sustained the injuries when he was hit by his bike after crashing in qualifying for last weekend's Assen round, forcing him to miss the Dutch race, but he had hoped to be back on track for Mugello.

"I'm obviously very disappointed and angry," said Loris. "I was hoping I could get on track for this race, but the double fracture of the ninth and tenth ribs and distorting the AC joint injury forced me to raise the white flag for the first time in my career for Mugello.

"I'm sorry for the many fans who will be at Mugello, the track to which they are emotionally closest. I have many fond memories of this track, I wanted to turn my season in this circuit. Now I will have to rest, sit still for at least two weeks and try to get back on track as soon as possible".

Technical director Fabiano Sterlacchini, who will help out at the factory Ducati team this weekend (see separate story), revealed that the extent of the injuries was unexpected.

"After visiting the hospital in Assen it seemed that things were not so serious," he said. "Recent investigations have however found two fractures, one pretty serious one, that would put at serious risk the health of the rider if he decided to get on track.

"There is, in fact, the risk that the bone can come into contact with the organs and cause serious damage to Loris, for all these reasons we decided to forfeit the race. Unfortunately for Loris this was the most important race of the season."

The MotoGP grid will thus drop to 16 riders once again, despite the return of Dani Pedrosa.