Three-time F1 world champion and Mercedes non-executive chairman Niki Lauda underwent a lung transplant in Vienna on Thursday.
It was reported earlier that Lauda had recently contracted a nasty summer flu while on holiday at his home in Ibiza, with a severe cough forcing him to fly to Vienna and seek treatment.
It was believed the 69-year-old was on the mend but reports emerged Thursday evening that the F1 legend's condition had led to a "serious lung illness".
"Due to a severe affection of the lungs, Niki Lauda had to undergo a lung transplantation at the AKH Vienna today", said a brief statement from the Vienna General Hospital.
"The transplantation was done successfully by Walter Klepetko, head of thoracic surgery, and Konrad Hotzenecker.
"We kindly ask for your understanding that the family won't give any official statements and we ask to protect the privacy of the Lauda family."
As one will recall, Lauda's near terminal fiery crash in the 1976 German Grand Prix had left the driver fighting for his life for several days, the inhalation of toxic gases and fumes after the crash severely damaging his lungs.
Lauda has also twice undergone kidney transplants, in 1997 and 2005.
Gallery: The beautiful wives and girlfriends of F1 drivers
Keep up to date with all the F1 news via Facebook and Twitter
David Coulthard believes Formula 1 should finally consign engine-related grid penalties to history, arguing that…
Lewis Hamilton refused to blame misfortune for his Belgian Grand Prix struggles, instead pointing the…
A genuine rookie leading on his Grand Prix debut - and in his only F1…
Last weekend at Road America, motorsport fans gathered to celebrate the extraordinary legacy of Dan…
Mercedes heads into the Hungarian Grand Prix with one clear mission: stop leaving points on…
McLaren will arrive at this weekend's Hungarian Grand Prix armed with a raft of upgrades…