Formula One legend Michael Schumacher has been in a medically-induced coma since he fell on an off-piste section between two slopes in the ski resort of Meribel and slammed his head on a rock, prompting his evacuation to a hospital in the city of Grenoble.

During his visit to India, Damon Hill will meet elite athletes and spread the message worldwide about the 11th edition of the Mumbai Marathon which will take place on January 19.

Michael Schumacher has been in a medically induced coma since the accident on December 29.

French prosecutors will brief journalists on Wednesday on their investigation into Michael Schumacher's life-threatening skiing accident.

Investigators are focusing on the retired racer's speed when he fell and slammed his head on a rock on a small off-piste section of the Meribel ski resort, prompting his evacuation by helicopter to the Alpine city of Grenoble.

Michael Schumacher's 14-year-old son Mick, who was skiing with his father at the time, was also being questioned by investigators.

Michael Schumacher slammed his head against a rock on Sunday while skiing in the French Alps and is in an indced coma.

The retired seven-time world champion Michael Schumacher slammed his head against a rock on Sunday while skiing in the French Alps and has had two operations to remove bleeding and pressure on his brain.

German racing great Michael Schumacher remained in an induced coma and a critical condition, with his wife Corinna, 16-year-old daughter Gina-Maria and 14-year-old son Mick at his bedside in the French Alpine city of Grenoble.

Michael Schumacher's manager Sabine Kehm said that the severe accident was not due to speeding but was a result of a chain of unfortunate circumstances.

Michael Schumacher has been a coma since Sunday, when he was helicoptered to hospital after slamming his head on a rock while skiing off-piste in the upmarket resort of Meribel with his son.

Michael Schumacher underwent surgery overnight - his second since the fall on Sunday - and a brain scan Tuesday showed minor improvement. But doctors say the retired seven-time champion still has brain lesions.

Doctors said it was too early to know if Michael Schumacher, a seven-time F1 champion, would survive brain injuries suffered when he hit his head on a rock in a skiing accident in the French Alps.

In Michael Schumacher's home town of Kerpen, North Rhine-Westphalia, locals were also wishing for a quick recovery for the daredevil racing driver who first honed his skills on his father's local go-kart track as a youth.

Michael Schumacher, the most successful driver in Formula One history, arrived at the Grenoble hospital on Sunday, already in a coma, and immediately underwent brain surgery.

Michael Schumacher, who turns 45 on Friday, remains in critical condition after neurosurgical surgery at a Grenoble hospital, following his skiing accident Sunday when he fell and hit a rock.

"If someone had had this type of accident without a helmet, they would definitely not be here," one of the doctors treating Michael Schumacher at the hospital in the southeastern city of Grenoble told reporters.

Doctors at the hospital in the southeastern city of Grenoble where Michael Schumacher is being treated added it was still too early to make a prognosis on the famous patient.