During the launch of a TV show last month, Aamir said he has been approached by the poll panel to spread the message about the significance of voting.
Kohli was part of an awareness campaign for the Delhi assembly elections last year.
The sources said the national icons would also feature in print and electronic advertisements released by the Election Commission.
Over 814 million people will be eligible to vote in the 2014 elections, making it the biggest Lok Sabha polls -- and the biggest democratic parliamentary elections anywhere in the world.
