Michael Schumacher's condition is stable but remains critical eight days after the German suffered brain injuries in a skiing accident in France.
"The clinical state of Michael Schumacher is stable as he's under permanent care and treatment," Grenoble hospital said in a statement on Monday.
"However, the medical team in charge stresses that it continues to assess his situation as critical."
The retired seven-times Formula One world champion slammed his head on a rock while skiing off-piste on 27 December.
Schumacher has been in an induced coma since then and has undergone two operations in Grenoble.
The German, who turned 45 on Friday, is the most successful Formula One driver of all time with a record 91 race victories.