The producer said that the two actors' recent performances at the box office have consolidated their position, reports The Times of India.
"Currently, no-one can threaten Vidya's position, she's made a place for herself. And one person I would never release my film with would be Aamir Khan, because he is unbeatable," Kapoor claimed.
Khan is said to hold the record for the highest-grossing Bollywood film with his release 3 Idiots.
Balan has had three back-to-back commercial successes with No One Killed Jessica, The Dirty Picture and Kahaani.
Kapoor also went on record to speak about her transition from television to film production, saying: "I don't do the dirty work, I make others do it for me."
An announcement was recently made regarding an upcoming collaboration between the producer and Karan Johar.