Niki Lauda has hit a roadblock on his road to recovery following the lung transplant undergone by the F1 legend last summer.
The Mercedes non-executive chairman has been slowly but surely putting himself on the mend after a critical condition diagnosed in July led to heavy surgery for the Austrian.
While the transplant was deemed a success, Lauda underwent a lengthy convalescence period in intensive care and then at his home in Austria.
However, progress enabled the three-time world champion to travel to Ibiza in December where he unfortunately contracted a flu virus while celebrating Christmas with his family, a state of affairs that was bad news for Lauda's vulnerable immune system.
According to a report from Austria's Krone, the former driver was transported earlier this week back to the intensive care unit of Vienna's AKH hospital.
Lauda, who will be 70-years-old on February 22, had tentatively scheduled a return to the paddock for Melbourne, but that target may have to be pushed back following his latest medical setback.
Gallery: The beautiful wives and girlfriends of F1 drivers
Keep up to date with all the F1 news via Facebook and Twitter
Carlos Sainz has so far scored but a single point for Williams but team principal…
Lando Norris has fired back at Red Bull in the latest twist of Formula 1's…
Fernando Alonso endured a surreal and worrying moment during Friday’s second practice at the Bahrain…
Isack Hadjar is setting his sights on a third consecutive Q3 appearance in Formula 1…
McLaren hit the ground running at warp speed in Bahrain on Friday, leaving its rivals…
George Russell believes Mercedes are in the hunt for “the next best” result behind McLaren…