The actor was hospitalized Monday because of a gastric problem and was discharged the same day, after which he was asked to rest.
"Mithun da is okay now. He is feeling good. He even attended my wife Warda's birthday party, " Sajid Nadiadwala, the producer of the film, told from London.
"Housefull 2" is the sequel to the 2010 hit movie "Housefull".
The film will star Akshay Kumar along with Asin Thottumkal. It will also feature Ritesh Deshmukh, Randhir Kapoor and Chunkey Pandey from "Housefull" and will feature new additions John Abraham, Jacqueline Fernandez, Rishi Kapoor, Zarine Khan, Shazahn Padamsee and Shreyas Talpade apart from Mithun.