Michael Schumacher's condition has not changed in the last week, according to a report in the German press.
The seven-time World Champion suffered severe head trauma two weeks ago when he fell while skiing, hitting his head on a rock.
Schumacher underwent two operations and was placed in a medically induced coma.
Last Monday his family gave the last update on his condition before asking the world's media to leave them alone during this difficult time.
According to Bild, Schumacher's health has not changed since that update and the 45-year-old remains in a "stable but overall critical" condition.
The newspaper added that "currently more tests are being performed" as "the doctors want to see which areas of the brain are damaged and which are functional."
As to when an official update may be forthcoming, it could take "weeks" or even "months."