Seven-time Formula One world champion Michael Schumacher is being treated with a cutting-edge stem-cell therapy in a Paris hospital, according to reports in France.
The Paris hospitals authority, citing France's strict medical privacy rules, said it could not comment on a report in Le Parisien that Schumacher was admitted under tight guard on Monday to the Georges-Pompidou hospital.
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The paper says the treatment is scheduled to be administered on Tuesday.
His long-time manager Sabine Kehm did not respond to emailed requests for comment.
Schumacher suffered a near-fatal brain injury in a 2013 skiing accident in the French Alps.
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Schumacher's condition stabilised after he was placed in a drug-induced coma, from which he later emerged.
Since September 2014, he has been cared for at home on the shores of Lake Geneva.