AKQA won the business, worth an estimated £3m, following a pitch believed to include Avenue A/Razorfish, Digitas' Modem Media, IMC2, OgilvyOne and R/GA.
The agency would not comment on the win, but insiders believe it reflects the rising importance of digital marketing to the Coke brand.
The soft-drinks giant is said to view digital channels as key to reaching the lucrative youth audience. Coke has three websites -- iCoke.com, MyCoke.com and fridge.com -- but it is not known whether future digital initiatives will link with these.
Separately, Coca-Cola is poised to hire either Red Cell Madrid or Wieden & Kennedy Amsterdam to work on its "global brand idea".
If you have an opinion on this or any other issue raised on Brand Republic, join the debate in the .