Michael Schumacher's doctor has blasted claims that he was carrying out "experiments" on the stricken Formula One legend.
Dr Philippe Menasche treated Schumacher in Paris last month with local media labelling the procedure as "experimental".
Little is known about the operation, but it is believed Schumacher received transfusions of inflammation-reducing stem cells.
Speaking to Italian newspaper La Republica, Menasche slammed the reports.
"I do not perform miracles," he said. "My team and I are not doing an experiment – an abominable term that is not in line with a serious medical view."
The seven-time world champion's condition hasn't been made public knowledge but a nurse told a local paper she could assure he was "conscious".
Schumacher's health has been kept in close secrecy ever since suffering a near-fatal brain injury when skiing with his son Mick in 2013.
The 50-year-old German driver spent three months in a medically induced coma after the accident and is currently under intensive care at his home in Switzerland.
• Motorsport: Michael Schumacher is 'conscious' - nurse reveals
• Motorsport: Michael Schumacher admitted to hospital for secret treatment - report
• Motorsport: Close friend hints Michael Schumacher struggles to communicate
• Motorsport: Michael Schumacher's family set to open up for the first time in new documentary
In January, he was taken by helicopter to the family's home in Mallorca for his birthday.
In a post on Instagram for Schumacher's birthday, his family wrote: "Please understand if we are following Michael's wishes and keeping such a sensitive subject as health, as it has always been, in privacy."
They also confirmed that Schumacher was in "the very best hands".
Earlier this year, the head of Formula One Ross Brawn spoke publically about Corinna's decision to keep her husband's life in private.
"I am constantly in touch with Corinna, and I totally agree with their decision," he said.
"Michael has always been a very private person and that's been a guiding principle in his career, his life and his family always agreed with that choice.
"It's completely understandable that Corinna has wanted to maintain the same approach, even after the tragic event, and it's a decision we must all respect.
"I'm sure the millions of people who are still Michael fans will understand it, too."