The Spanish sports news website AS has estimated that the cost of Michael Schumacher’s treatment is £124,000 (€140,000) a week.
That figure includes the entire team of doctors, nurses and caregivers, in addition to the equipment the F1 star has at home.
He was discharged from hospital in September 2014 and is believed to be constantly cared for at his home in Switzerland during his rehabilitation.
His family has closely guarded his privacy and released very little information on any possible recovery.
GettyMichael Schumacher in 2012iPhone transfer software
He is believed to be cared for by a 20-strong team of nurses and physicians at his custom built mansion on the shores of Lake Geneva.
The German motor racing star, who turned 49 today, was left fighting for his life after a tragic skiing accident in the French Alps four years ago when he suffered catastrophic head injuries.
Mr Schumacher was put into a medically induced coma after he fell and hit his head on a rock while skiing with his son at the Meribel resort in the French Alps on December 29, 2013.
In the wake of the crash, the record-breaking Formula 1 driver underwent two life-saving operations at Grenoble Hospital, before being transferred to a medical facility