Nicky Hayden remains in an ‘extremely critical’ condition, according to a statement released by the Maurizio Bufalini Hospital in Italy, where the American is being treated following a cycling accident on Wednesday.

The 2006 MotoGP world champion was training on his bicycle in Rimini on Wednesday afternoon when he was struck by a car. Hayden was treated at the scene before being transferred to hospital, where he was put into the intensive care unit.

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Hayden suffered severe pelvic and abdominal injuries, as well as serious trauma to his head and brain. His fiancée Jackie, brother Tommy and mother Rose have flown from the United States to Italy to be with Hayden.

At 16:00, the hospital released this statement: “Nicky Hayden’s clinical condition remains extremely critical.

“The young man, who is still in the intensive care unit of the Cesena’s Bufalini hospital, has suffered a serious polytrauma with subsequent serious cerebral damage.

“The prognosis remains reserved.”

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Since the accident, the entire motor racing community has expressed their support and extended their best wishes to the American.

“Very, very bad news from yesterday,” said Valentino Rossi, a former team-mate of Hayden’s at Honda and Ducati, in today’s French Grand Prix pre-event press conference.

“I spoke straight away with a doctor, my friend, and he said that from the very first moment the situation was very difficult for Nicky. And now with a bit more time you start to understand.

“It’s a great shame because Nicky is a great rider for sure, a great talent, a world champion and always at the top, but especially a very good guy.

“Coming from a good family of racers, from his father to his two brothers, always a good guy, always smiling, so for sure it’s very bad. I think the situation is very bad, but for everybody, we hope for the best.”

Marc Marquez, who was partnered by Hayden at last year’s Australian Grand Prix, added: “Since 2008, when I joined the Repsol KTM team in 125cc, he was a really nice guy with me.

“In Australia, I spent a lot of time with him. It was really nice, we had an incredible party on the Sunday night.

“I remember that he was going to sleep, but then he stayed until six in the morning with me because he enjoyed it a lot. I wish the best for him, but especially all his family.”