Niki Lauda will miss all of the remaining races this season, according to a report.
The Formula 1 legend and Mercedes team chairman is reportedly still in intensive care in Vienna following a life-saving lung transplant.
Lauda's friend Dr Helmut Marko, of Red Bull, told Bild that he has not been able to visit the 69-year-old.
"Only his family, so his wife and his children, can visit him," the Austrian said.
"The doctors say the danger is that he will become infected with a virus or other people's bacteria.
"We all miss him. Mercedes misses him, Formula 1 misses him. Everyone misses him - his charisma, his straight words."
The newspaper says that Lauda will not attend any of the remaining seven races this year, but Marko insisted: "Niki will fight through this and be with us again. We need him."