World Cup sponsor Coca-Cola is giving away up to a million limited-edition footballs in its summer marketing push.

The activity will feature on 1.25l, 1.75l and six, eight and 12-can multipacks of Coca-Cola and Coke Zero. Consumers take part by entering online a code found on promotional packs.

For each valid entry, Coke will donate 10p to StreetGames, a UK charity that brings sports to young people in disadvantaged communities.

The push will run from 29 April to 13 July.