Kellogg, the food manufacturer, has called a review of its European digital creative and media planning and buying business.
The Dentsu Aegis Network agencies Carat, iProspect and Isobar currently handle the accounts and have been in-vited to repitch.
The review is being handled by Chris Nolan, Kellogg’s EMEA director of media and digital, and the internal procurement team.
The appointed agencies will handle the business from the beginning of next year.
Carat picked up the media account in 2008 after fighting off competition from Mindshare, which had been the incumbent for eight years.
Isobar won the digital business in 2010, when it was known as Glue Isobar.
Kellogg is sponsoring Team GB at this summer’s Olympic Games in Rio de Janerio.
Last year, Isobar created an online video for the Kellogg crisp brand Pringles, in which a prank is played on holidaymakers singing karaoke in Ibiza.
A Kellogg spokesman said: "It is Kellogg’s practice to regularly review all agency relationships and to hold a competitive pitch when committing to a retained agency."