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The CIES Football Observatory’s Annual Review presents original analyses of the big-5 European league players. This reference publication reveals the key factors for success through a novel “demo-technic” approach that combines the study of players’ demographic profile and their on-pitch performances both on an individual and collective level. The five chapters that make up this key reference publication cover the following areas: player selection and turnover; age structure and club experience; mobility and contracts; club pitch performance; player pitch performance.