The actor injured his knee while shooting for "3 Idiots" in 2009 and he again hurt his knee during the shoot of Tamil film "Vettai".
He under went a knee surgery last year in Australia and is now recovering.
The 41-year old actor regrets not listening to his doctor. "I wish I had listened to my docs and taken a break earlier for my physiotherapy. Things would have healed so much faster. Big mistake," tweeted the actor.