"The clinical picture remains extremely serious and compared to the previous day there have been no changes".
The American, who won the title in 2006, was struck by a auto while training on a bicycle along the Rimini coast and admitted to a local hospital, before being moved to the Maurizio Bufalini Hospital in Cesena.
Hayden's fiancee Jackie and team members had been joined at his bedside by brother Tommy and mother Rose, who flew in from the United States.
According to Maurizio Bufalini from Cesena hospital, the American suffered a severe cerebral damage, followed with polytraumas and chest injuries.
Nicky Hayden's medical condition was called "extremely critical" by the hospital in Italy where he was taken after he was hit by a vehicle while bicycle training Wednesday.
"Following the incident, Nicky was treated on site by medical staff and then taken by ambulance to a hospital near Rimini for immediate treatment".
During the summer of 2011, 2006 MotoGP World Champion Nicky Hayden got to do a parade lap around the Snaefell Mountain Course during the Isle of Man TT.
The smashed window of the vehicle that hit Nicky Hayden.
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"We were teammates in his rookie year in 2003, when he was a young guy making his debut in his first European experience".
"The most attractive thing I have about him is when he gave his hand to me after the unlucky race of Valencia 2015, on the lap of honour". In the MotoGP, he ran 218 Grand Prix races with three wins and 28 podium places.
"Come on Nicky, we're all with you", added the 38-year-old.
Hayden, who has also raced for Ducati, won the MotoGP world championship for the Repsol Honda team in 2006.
The dangers of training on public roads have been highlighted in recent weeks by other accidents affecting professional athletes.
Britain's Tour de France champion Chris Froome escaped unhurt this month while having his bike written off in a hit-and-run incident near his Monaco home.
"Hayden was involved in a training accident whilst cycling in Italy".