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Monthly Report 12

Foreign players in football teams


The twelfth Monthly Report of the CIES Football Observatory analyses the presence of foreign players in 37 top division leagues worldwide: 12 European, 12 Asian, 12 from Latin America and the American MLS. Overall, foreign players represent 26.6% of squads, with a maximum of 66.5% in the English Premier League and a minimum of 6.1% in the Brazilian Serie A.

Monthly Report 11

Squad profile of the best performing national A-teams


Issue number 11 of the Monthly Report compares the profile of 50 national A-team squads at worldwide level from the perspective of age, height, employer clubs and place of birth. The study notably shows the high concentration of talent in the wealthiest leagues. Almost one minute out of two was played by big-5 league footballers. In total, 68.9% of minutes were played by footballers under contract with foreign clubs. England is the only squad who did not field footballers playing abroad.

Monthly Report 10

Relative age effect: a serious problem in football


The tenth Monthly Report of the CIES Football Observatory analyses the relative age effect on the possibility of a career in football. The study shows that players born in the first months of the year are over-represented among professional footballers. It also highlights the existence of a selection bias favouring players with precocious physical development. The limiting of this phenomenon would reinforce meritocracy in football.

Monthly Report 9

Youth training in European football: a comparative analysis


Youth training is of fundamental importance for football. Without quality training, the sporting development of the game cannot be guaranteed. The level of spectacle would also be diminished, thus limiting the economic potential of the sport. Issue number 9 of the Monthly Report analyses trends in the percentage of club-trained players in 460 teams of 31 top division European leagues. It also presents clubs who have trained the most footballers participating in these competitions.

Monthly Report 8

Exporting countries in world football


The eighth edition of the CIES Football Observatory Monthly Report analyses the origin of foreign players in 6,135 professional and semi-professional clubs, within 458 leagues located in 183 countries worldwide. In total, 18,660 foreign players from 194 origins were recorded. The study notably shows that Brazil is the most represented among foreign nationals, followed by Argentina and France.

Monthly Report 7

How to build a team for long term success?


Since 2005, the CIES Football Observatory has developed pioneering data analysis to understand the logics of success in football. This Monthly Report unveils the key findings related to the four main dimensions of sustainable squad management: team chemistry, demographic structure, performance analysis and transfer policy.

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