NEW YORK--Capital One has agreed to let Publicis shops Leo Burnett in Chicago and New York-based Publicis and Saatchi & Saatchi compete for its $170 million account before looking outside of the holding company, sources said. The three agencies were briefed by the client last week, said sources. The account was initially headed for Publicis after its Paris-based parent decided to fold Capital One's shop, D'Arcy Masius Benton & Bowles. But recently, the Falls Church, Va., company has contacted search consultants. Agency officials could not be reached.