Seven-time Formula One champion was admitted to Georges-Pompidou hospital in Paris earlier this week, a report claims.
He has allegedly undergone transfusions of inflammation-reducing stem cells after he suffered a near-fatal brain injury in a skiing accident in 2013.
According to Le Parisien, a nurse revealed that the 50-year-old is now conscious after undergoing surgery.
"Yes, he is in my service... And I can assure you that he is conscious," the nurse told the French newspaper.
The German is expected to be discharged from the hospital in France today after having the groundbreaking surgery.
After the terrible skiing accident, Schumacher's condition stabilised when he was placed in a drug-induced coma.
He later emerged from the coma and since September 2014 the racing champion has been receiving specialist care at his home in Lausanne, Switzerland.
Le Parisien reported Schumacher has been treated at least twice before his latest stay at the same hospital.
The newspaper cited unnamed sources and added that he was admitted each time under a false name and treated by a small medical team.
Yes, he is in my service... And I can assure you that he is conscious.
It was reported that Professor Philippe Menasché treated Schumacher with "infusions of stem cells" which are supposed to cause "systemic anti-inflammatory action".
The Professor then added that details of Schumacher's treatment would remain "secret" due to medical confidentiality.
Schumacher's spokeswoman has declined to comment on the development.
Back in 2013, Schumacher was skiing off-piste in Méribel in the French Alps with his son Mick - who's followed in his father's footsteps and now races in Formula 2 - when he fell and hit the right side of his head on a rock.
Schumacher was wearing a helmet at the time, yet it split open when he fell.
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