The F1 star was transported to Paris last week for new secret treatment. He is has not been seen since suffering a traumatic brain injury in a skiing accident in Grenoble in 2013. But positive signs have been given after a nurse at the cardiology unit gave an update on his situation.
Schumacher was said to have received transfusions of inflamation reducing stem cells.
The former Ferrari driver was under tight supervision.
The hospital worker told Le Parisien: “Yes he is in my service. And I can assure you that he is conscious.”
This follows former F1 Ferrari leader Jean Todt revealing he had spent 45 minutes with Schumacher yesterday.
Mr Todt arrived to see his friend at 5.15pm and then “quietly left the hospital”, the French newspaper said.
Surgeon Professsor Philippe Menasche welcomed Schumacher. The 69-year-old heart expert is well known for performing the world’s first embryonic cell transplant on a patient with heart failure.
Schumacher was said to have had a fresh health scare before he was taken to the Pompidou hospital for stem-cell treatment.
The F1 legend, who turned 50 in January, was taken to the hospital in a yellow and blue Geneva ambulance.
His face and body was covered by a blue cloth as he entered the Cardiovascular Surgery Department on Monday.
Around 10 people were with the seven-time F1 championship winner. Reports from the scene said the state-of-the art hospital had been “turned into a bunkier”.
Treatment then started on Tuesday morning and Schumacher is expected to return to his home in Geneva today.
Professor Menasche has insisted the treatment must remain “secret” because of patient confidentialiy rules.
And the Schumacher family has remained tight-lipped on his progress.
Schumacher has visited the hospital twice before by helicopter.
Schumacher was with his son Mick when he hit a rock while skiing. The blow ripped apart his helmet and left him with blood clots.
The driver’s illustrious career saw him win five of his seven world championships with Ferrari. He won the other two with Benneton
Thousand of fans have offered best wishes to the F1 star.
One wrote on Twitter: Very glad to hear Schumi’s news…I really hope a miracle happen… lets go.”
Another said: “Fingers crossed for Michael Schumacher. Hope his surgery goes well today. Can’t deny what a legend he is and hope he’s restored to full health.”
Another wrote: “I only want to hear what the family want to tell us.. Schumacher was a proud man & it’s no ones business.. I just hope there is hope for a meaningful recovery.”
Schumacher’s management have declined to comment and there is no official statement on his health status.
Back in 2016, manager Sabine Kehm said shed some light on the reason for the secrecy when she said: “When he was in Switzerland it was clear Michael was a private individual.
“Once in a long discussion Michael said to m: ‘You don’t need to call me for the next year. I’m disappearing.”
But Schumacher’s former Mercedes boss Nick Fry has urged the family to be more open about the health situation.
Mr Fry, the ex-CEO for Mercedes, said: “Because of what he achieved, people would like to know about his condition; they are inquisitive and they genuinely feel for him.”
The F1 chief was writing in his new book Survive. Drive. Win where he added: “Corinna and the family have kept a very tight control on information about his treatment which, I think, is a pity.
“There are millions of people out there who have genuine affection for Michael, and that’s not just his fans in Germany or fans of Mercedes Benz.”