It is unclear as to whether Kellogg has contacted rival media agencies to pitch for the account and the cereal firm said there were no plans for a wider global review.
Kimberley Goode, a Kellogg spokeswoman, said: "Kellogg is reviewing media buying practices in the US as part of our normal business process to look for opportunities to strengthen our business."
The Publicis Group-owned agency has held the account as Starcom and Leo Burnett for more than 50 years. Leo Burnett also handles the creative on a number of key brands, including Kellogg's Corn Flakes.
The UK review saw MindShare win after a shootout against Starcom and Carat. The Aegis-owned agency is the third agency on the Kellogg global roster alongside MindShare and Starcom.
While Starcom handles Kellogg's US planning and buying, Carat works for the cereal company in France and Germany.
Like Starcom and Leo Burnett, the MindShare relationship with Kellogg stretches back for many years. The agency has held the account since it was created and prior to that its relationship dates back decades through the then J Walter Thompson media department.
WPP's JWT and Leo Burnett share creative responsibilities on the Kellogg business.
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