 Only two characters — those of Munna Bhai ( portrayed by Sanjay Dutt ) and Circuit ( portrayed by Arshad Warsi ) — were retained from Munna Bhai M.B.B.S. Several actors from Munna Bhai M.B.B.S. , appeared in Lage Raho Munna Bhai as different characters . Vidya Balan was chosen to play the leading lady as her voice was thought to be appropriate for that of a radio jockey . 
