Graham Darracott, sales and marketing director at Graphico, said: "This is the first time Pepsi has truly integrated an online campaign with its offline work. We're effectively asking consumers what they want."
An e-game will back Pepsi's 'Sumo' TV ad, which features footballers such as David Beckham and Juan Sebastian Veron.
The game challenges players to arrange 11 sumo wrestlers into the traditional positions of a football team by twanging their underwear.
By registering to play, users are entered into a draw to win a branded table football game.