The process of moving him out of the medically induced coma is still taking place, said Sabin Kehm.
He hit his head on a rock while skiing in the French Alps leaving him in hospital with severe head injuries.
Schumacher's family has released few details about his condition. French doctors operated to remove blood clots from his brain, but some were too deeply embedded.
Neurologists not involved in his treatment say the chances of a full recovery for the 45-year-old are increasingly slim, given the coma's duration and the extent of his injuries.