Niki Lauda is back in intensive care.
The Formula 1 legend and Mercedes team chairman had been holidaying in Ibiza following his long recovery from a life-saving lung transplant operation.
69-year-old Lauda had to fly back to Vienna after contracting a serious flu illness.
"There was an influenza case in his family, and he is treated in an intensive care unit with us," a spokeswoman for the AKH hospital confirmed.
"He had to go back to Vienna because there were no specialists in Ibiza familiar with lung transplants," the report added.
"The situation was serious in the first days of the new year, but Lauda is already doing much better again."
