Schumacher has undergone two operations to remove blood clots and reduce swelling since suffering a head injury in a skiing accident on 29 December and is currently in a medically induced coma at Grenoble University Hospital in France.
Manager Sabine Kehm said: “The clinical state of Michael Schumacher is considered as stable and is being continually monitored by the medical treatment administered to him.
“However, the medical team in charge emphasise that they continue to judge his condition critical.”
Prosecutors are expected to release details of their investigation into the incident tomorrow.
The 45-year-old is thought to have hit his head on a rock after a fall when skiing off-piste at the Meribel resort in the French Alps.
Schumacher was wearing a camera on his helmet and the footage has been voluntarily handed over by his family, while a fellow skier inadvertently videoed the accident on his mobile phone as he recorded his wife on the slopes in the foreground.