Former F1 driver Alex Zanardi remains in a serious but stable condition in intensive care after a handbike accident in Italy.
Zanardi was airlifted to Siena's Santa Maria alle Scotte hospital on Friday after he sustained head injuries and underwent a near three-hour operation.
An update from the hospital on Sunday morning confirmed the 53-year-old was still under sedation, intubated and breathing with the help of a ventilator.
"The current conditions of general stability still do not allow us to exclude the possibility of adverse events," the hospital said in a statement.
Zanardi had both legs amputated after crashing in the American Memorial 500 Cart race at Lausitz, Germany, in September 2001.
Sky in Italy reported that Zanardi had been competing in the 'Obiettivo Tricolore' road race for Italian Paralympic athletes.
The Italian news agency ANSA reported sources saying the accident involved a truck on a state highway near the town of Pienza to the south-east of Siena.
"You have never given up and with your extraordinary fortitude you have overcome a thousand difficulties," said Italian prime minister Giuseppe Conte on Twitter on Friday.
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"Come on Alex Zanardi, don't give up. All of Italy is fighting with you."
Zanardi competed in 41 grands prix in the 1990s and raced for four teams - Jordan, Minardi, Lotus and Williams.
A hugely-admired figure, Zanardi has received messages of support from across motorsport.
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