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AZ Alkmaar is a Dutch professional football club based in Alkmaar, North Holland. The club was founded in 1967 as a result of the merger of three clubs from the city of Alkmaar: Alkmaar'54, Alkmaarsche Boys and Volendam. The club has won two Eredivisie titles, five KNVB Cups and one Johan Cruyff Shield. Romero joined AZ Alkmaar in 2009 from Argentinian club Racing Club de Avellaneda.