Prime Minister Narendra Modi, apart from film fraternity members, prayed for Rakesh's good health.
Hrithik shared the news via social media on Tuesday morning, before the senior Roshan underwent surgery.
"Asked my dad for a picture this morning. Knew he wouldn't miss gym on surgery day. He is probably the strongest man I know.
"Got diagnosed with early stage squamous cell carcinoma of the throat a few weeks ago, but he is in full spirits today as he proceeds to battle it. As a family we are fortunate and blessed to have a leader like him," Hrithik captioned the picture in which the father-son duo have struck the same pose.
The note drew speedy recovery and good luck wishes from Modi, the film fraternity and fans.
To this, Hrithik responded: "Thank you sir for your concern and good wishes. I am very happy to inform that according to the doctors, his surgery has gone off well."
Hrithik's former wife Sussanne Khan wrote: "He is stronger than any superhero. All will go smoothly."
Apart from his acting career, Rakesh Roshan is known for directing films like 'Kishen Kanhaiya', 'Karan Arjun', 'Kaho Naa... Pyaar Hai', 'Koi... Mil Gaya' and the superhero 'Krrish' film series.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)