His manager Sabine Kehm said his condition has not changed since doctors said he showed small signs of improvement on Tuesday, following his second operation.
Schumacher, who turns 45 tomorrow, suffered critical head injuries when he fell and struck a rock while skiing on Sunday morning during a family holiday at Meribel in the French Alps.
His 14-year-old son, Mick, was with him in a group of friends when the accident happened in a rock-strewn area of open ground between two pistes.
The seven-time F1 champion has since undergone two brain operations and remained in a medically-induced coma last night.
“The good news for today is... there’s no significant changes,” Ms Kehm said outside the University Hospital in Grenoble where Schumacher is being treated.
“However, it is still very early, and the situation overall is critical. Everything can change immediately,” she added.
Doctors have refused to give a prognosis for Schumacher, saying they are focused on his immediate care.
They are trying to reduce swelling in his brain by keeping him in a coma and lowering his body temperature to between 34-35C.
Doctors carried out an operation on Monday to alleviate the build-up of pressure in Schumacher’s skull as a result of internal bleeding.