FIA president and former Ferrari team principal Jean Todt arrives to visit Michael Schumacher in hospital on Thursday © Getty Images Enlarge

Ferrari says it plans to hold an event in Grenoble to mark Michael Schumacher's birthday on Friday while he remains in a coma in hospital.

Schumacher will turn 45 on Friday, but has so far spent four nights in an artificial coma after suffering multiple head injuries in a skiing accident on Sunday. With Schumacher having won five world championships with Ferrari, the team has announced it is planning an event in Grenoble - where he is being treated - to show support.

"In these difficult days and on the occasion of his birthday the Scuderia Ferrari Clubs want to show their support for Michael Schumacher, organising tomorrow a silent and respectful event all in red at the Grenoble University Hospital Center," the team announced on its Facebook page.

There was no further update as to Schumacher's condition on Thursday, with his manager saying on Wednesday that there would not be another press conference until there is further news to report.

Schumacher's family did issue a message on his official website, thanking fans for their support and adding: "We all know he is a fighter and will not give up."

© ESPN Sports Media Ltd.