However, his condition turned into severe pneumonia, which meant Lauda had to be connected to a heart-lung machine to supply his blood with the oxygen.More news: Kim Kardashian changes daughter's name, 'it doesn't flow'
Lauda was severely burned in an accident at the 1976 German Grand Prix and had fluid vacuumed from his lungs so he could return to racing in just six weeks, an event chronicled in the Ron Howard-directed film "Rush", which stared Daniel Brühl as Lauda. Lauda, who also required kidney transplants in 1997 and 2005, is the father of four children from two marriages - Lukas (39), Mathias (37) and eight-year-old twins Max and Mia.
As flames surrounded his auto, Lauda was rescued by his fellow drivers and suffered severe burns.
Dr Walter Klepetko, who is the hospital's head of thoracic surgery, told Austrian broadcaster ORF that "everything is now going very well and we are very satisfied".More news: Canadian dollar falls after Saudi Arabia reportedly sells off assets
On Monday, the hospital in which Lauda is now recovering issued a statement to provide a brief update.
"For all of us at Mercedes he is our chairman, our mentor and our friend", he added.
"We have missed him by our side in Hockenheim and Hungary, and can't wait to have him back with us", said Wolff. But knowing Niki, I'm sure he will soon be telling every nurse and doctor that he has had enough of the hospital.More news: Heat warning remains in effect for today across southern Ontario
The F1 legend fell ill while on holiday in Ibiza last month, with a chronic cough compelling the Mercedes non-executive chairman to seem medical help in his home country.