Taking to Twitter, Kapoor denied that his hair turned grey "overnight" and clarified that he dyed them for his look in the film.
"This is to dispel all notions and wrong speculations of my hair turning grey/white overnight. My hair was dyed by Awan Contractor for a film produced by Honey Trehan and Sony pictures directed by Hitesh Bhatia. The film is untitled. Trust this clears the air," he wrote.
Earlier this month, there were reports that Rishi was suffering from a serious illness following his absence from the funeral of his mother, Krishna Raj Kapoor, who passed away on October 1.
His brother, Randhir, had denied the reports and had said, "He is at the moment fine. As he is in great pain, he will be undergoing the test. He did discuss it with us regarding his health," Randhir had told PTI.
(With inputs from agencies.)