Francois-Xavier Perroud, corporate spokesman for Nestle, said: "We are presently exploring the potential of global competitive media advantage and have been in discussions with our aligned advertising groups, Interpublic, WPP and Publicis."
He said that there was a global challenge to assess media and find a unique solution for Nestle that was appropriate for its local markets.
Other reports suggest the review has been sparked by the appointment of a new executive vice-president of marketing, Ed Marra, in an attempt to make cost savings.
Nestle's media agencies include WPP Group's MindShare, Omnicom's OMD, Interpublic's Universal McCann and Publicis Groupe's ZenithOptimedia.
Creative agencies on the Nestle Rowntree UK roster, J Walter Thompson and Lowe, are already on alert after its new managing director Chris White announced a review of its advertising and marketing strategy in February.
The company is well known for its confectionery, with brands such as Kit Kat, Milky Bar and Quality Street. It also has a large petfood division, owning Friskies and Felix, beverages such as Nesquik and Nescafe, and owns the Perrier, Vittel and Sanpellegrino bottled water brands.
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