Niki Lauda's push to return to good health and the F1 paddock has suffered yet another setback.
Osterreich newspaper reports that the F1 legend and Mercedes team chairman is currently receiving kidney dialysis treatment at a private clinic in Switzerland.
It follows an earlier setback for the 70-year-old in the wake of his lung transplant last year, when he had to return to intensive care with Influenza.
In addition to his 2018 lung transplant, Lauda had kidney transplants in 1997 and 2005.
"Due to kidney problems, he had to be transferred from the rehabilitation centre to a private clinic for dialysis," Lauda's brother Florian confirmed.
Lauda's business partner at Mercedes, Toto Wolff, told Bild am Sonntag newspaper that he visited the great Austrian last week.
"Niki has good weeks and also some setbacks," Wolff said.
