Alex Zanardi is in mortal danger two days after his accident with a handbike. Doctors continue to worry about the neurological condition of the former Formula 1 driver and four-time paralympic champion on Sunday.

53-year-old Zanardi has been kept in an artificial coma in the intensive care unit of a hospital in Siena since Friday after surgery for fractures in his skull and face. The former Jordan, Minardi and Williams driver is given artificial respiration.

It is still unclear to what extent Zanardi suffered brain injuries in his accident, which took place in Tuscany on Friday. The Italian ended up on a road between Pienza and San Quirico d'Orcia on the wrong side of the road and collided with a truck. An hour later, he was hospitalized.

According to the doctors, it can be ten days before it becomes clear exactly to what extent Zanardi can recover. In addition to concerns about his neurological state, the doctors also fear that he will continue to experience visual consequences from the accident.

Zanardi raced in Formula 1 from 1991 to 1994 and in 1999. In 2001, his legs had to be amputated after a crash at the German track Lausitzring. In recent years, the Italian was very successful as a hand biker. He won gold twice at the Paralympic Games in London in 2012 and in 2016 in Rio de Janeiro.

According to Italian media, the hospital in Siena will release a new update on Zanardi's health condition later on Sunday.