Bachchan, 71, who also shared screen space with the actor in 'Trishul', 'Silsila', 'Kabhie Kabhie', 'Namak Halaal' among others, took to Twitter to give his best wishes.
"May the Almighty be by the side of one that has been ill in Hospital for a few days and make him his usual self again ..!" he tweeted.
Kapoor, 76, was admitted on September 21 to the intensive care unit (ICU) of the Kokilaben Dhirubhai Ambani Hospital after he complained of acute cough and breathlessness.