Publicis and Yorum have worked together since 1992, sharing the Renault client Yorum has run since the agency was founded in 1981. It also handles Garnier, Coca-Cola, Nestle and Whirlpool.
Allmedia, a media planning and buying agency, will team up with Starcom Mediavest to create Starcom Allmedia. Bold, a direct marketing agency, will become part of the Publicis Dialog network, while Zone, a consultancy and PR agency, will become part of the Publicis Consultants string.
Maurice Levy, the chairman and chief executive of Publicis Groupe, said: "Turkey is an important country for us. Its growing economy holds considerable potential."