Currently most of Unilever's media services are provided by agencies from within the WPP, Omnicom and Interpublic marketing groups. All three agency groups will be invited to re-pitch for the account.
The markets under review include Argentina, Mexico, North America, UK, France, Germany, Spain, Italy, Netherlands, Poland, Russia, India and China.
Unilever last reviewed its £680m European media accounts in 2004, with Mindshare winning out over Initiative and Carat.
Globally, Unilever's annual advertising spend is in excess of $5 billion.