Niki Lauda will return to Formula 1 when he is ready.
That is the news from the F1 legend's son Mathias. Earlier, Lauda - who turns 70 on Friday - targeted his return to the paddock from a lung transplant for the Barcelona tests.
'Fighting like a lion'
But he is not yet strong enough even to travel to Australia for the season opener.
READ: 'I'm throwing away the walker' - Niki Lauda aims to walk again by February
"He is fighting like a lion. He wants to return to normal life as soon as possible," Mathias Lauda told DPA news agency.
But Mathias said his father no longer has a particular return date in his diary.
"There is no time limit, what is important is that his body returns to his old strength," he insisted.
Mathias admitted that a return for the start of the 2019 season is too soon, but "wait and see".