The operation will be performed by world renowned French professor and cardiologist Dr Philippe Menasche, according to reports in Italian media. Schumacher is reportedly undergoing pioneering surgery which will see damaged cells replaced with healthy ones, which have been harvested from bone marrow or blood. He is understood to have performed surgery on the Formula 1 racing legend in September last year.
Mr Menasche is a leading light in stem cell therapy and was reportedly using surgery to transfer cells from his heart to the brain, according to Spanish publication 20minutos.
The treatment took place at the Georges-Pompidou Hospital and according to Schumacher’s doctor, professor Jean-Francois Payen he returned again in the same month for treatment.
The German legend’s health has been a closely guarded secret since he suffered catastrophic brain injuries in a skiing accident in 2013.
The German driver was placed in a medically induced coma for nearly six months but then in June 2014 was discharged from hospital and has since been receiving medical care at home near Lake Geneva in Switzerland.
French newspaper Le Dauphine reports the latest operation could take place “in the next few days”.
Leading neurosurgeon Dr Nicola Acciari said she was unable to say what the results of the operation will be.
She said: “Over the past 20 years, science has made enormous progress with stem cell treatment.
“But that does not change that we still do not know much about the human brain.
“We are not able to say what the results will be.”
The surgeon previously told Contro Copertina the racing legend is now a “very different person” saying: “We must imagine a person very different from the one we remember on the track, with a very altered and deteriorated organic, muscular and skeletal structure.
“All as a result of the brain trauma he suffered.”
During his previous reported stem cell treatment, Mr Menasche was forced to defend himself over accusations he was using Schumacher as an experiment as opposed to a patient to operate on.
The professor at the University of Alabama and leader of the National Institute for Medical and Health research hit back and said: “There was great attention to our department, but it has already returned to normal.
“There has been great progress in the last 20 years, but the truth is that we still know little.”
Schumacher’s long-term friend and Ferrari manager, Jean Todt visited Schumacher to watch a Grand Prix.
Although he visited Schumacher, he was careful not to reveal any specific details on his condition.
The only detail he did reveal was that the former Formula One star does not “give up and keeps fighting”.
Mr Todt said: “I’m always careful with such statements, but it’s true.
“I saw the race together with Michael Schumacher at his home in Switzerland.
“Michael is in the best hands and is well looked after in his house.
“He does not give up and keeps fighting.
“His family is fighting just as much and of course our friendship cannot be the same as it once was just because there’s no longer the same communication as before.”