The stricken seven-time Formula One world champion Michael Schumacher is in Paris' Georges-Pompidou hospital for cell therapy surgery, according to French daily Le Parisien.
The Paris hospitals department, contacted by AFP, refused to confirm or deny the news citing medical privacy laws.
But according to Le Parisien, the 50-year-old German is in the cardiovascular department overseen by surgeon Philippe Menasche, described as a 'pioneer in cell surgery against heart failure'.
Schumacher will receive stem cells to obtain an anti-inflammatory effect throughout his system, Le Parisien suggests.
"The treatment will begin on Tuesday morning and (he will) leave the establishment on Wednesday," said Le Parisien, which claims the former Ferrari star has already been treated there twice this spring.
The athlete was struck down by a skiing accident that snapped his helmet in December 2013 and little information on his condition has been made public since then.
He was placed in a medically-induced coma for six months after the fall and was moved from Grenoble hospital to Lausanne before being returned home in September 2014 where he receives private treatment.
It has been suggested by old friends he is unable to walk or properly communicate.
Schumacher won his first world title 25 years ago and had won his first Grand Prix back in 1992. His glory years were spent at Benetton and Ferrari, for whom he won the last of his 91 Grand Prix victories in China in 2006.
He came out of retirement in 2010 for a three-year stint with Mercedes.
Fans revere the determined German and his name was chanted at the Monza circuit last weekend for Ferrari's most successful Formula One driver Schumacher, with his son Mick, who is part of the Ferrari Driver Academy, present.