Niki Lauda will be back in action "soon".

That is the claim of the Formula 1 legend's son, 37-year-old Mathias Lauda.

Lauda 'almost there'

"Dad underwent a complex operation and has had bad moments, but he has a strong character and is fighting," Lauda told La Gazzetta dello Sport.

READ: Niki Lauda to leave hospital 'in three to four days'

69-year-old Niki Lauda, the Mercedes team chairman, has finally returned home following surgery and rehabilitation for a lung transplant.

Two and a half months after a lung transplant, we’re delighted to hear that our Chairman and friend Niki Lauda has left hospital in Vienna.

Niki will now begin a phase of intensive rehabilitation, as he continues his road to recovery.

We can’t wait to have you back, Niki. pic.twitter.com/www1t64ZkM
— Mercedes-AMG F1 (@MercedesAMGF1) October 24, 2018

Niki's latest setback was a further hospitalisation for influenza.

"He needs to do physiotherapy to recover his energies. He is training furiously and I hope that soon we will see him in shape," Mathias said.

Mathias Lauda drives for Aston Martin in the world endurance championship.

Wheels24.co.za | Niki Lauda to be back in shape \'soon\' - son

Niki Lauda to be back in shape 'soon' - son