This report studies the fielding of minor footballers, under 18 years of age, in matches of the five major European leagues played over the 15-year-period between the 1st January 2009 until the 31st December 2023. The analysis covers the differences observed between leagues, the evolution over time, as well as the characteristics of the players concerned.

This report highlights the players born in 2003 or later who have accumulated the most playing experience over the last year (as at 11 December 2023), according the exclusive CIES Football Observatory ‘experience score’ metrics, in nine positions: goalkeepers, centre backs, left backs, right backs, holding midfielders, attacking midfielders, left wingers, right wingers and centre forwards.

The 89th edition of the CIES Football Observatory Monthly Report compares 48 leagues around the world according to the demographic characteristics of the players in their squads: 31 top divisions of UEFA member associations, nine of CONMEBOL, six of AFC and two of CONCACAF: the American MLS and the Mexican Liga MX.

Thanks to the new ’game intelligence’ data produced by our partner SkillCorner, it is now possible to understand all the types of runs made by players during a match. This report analyses the distribution of eight categories of ‘call-for-the-ball’ runs in 27 competitions around the world, highlighting different styles of attacking play at both club and league level.

This Monthly Report analyses the financial flows of football transfers on a global scale during the decade between 2014 and 2023. It presents the evolution of transfer fees incurred by clubs, their breakdown according to the age and position of the players concerned or the geographical area of recruiting teams, as well as the economic balance sheets of transfer operations, at both league and club level.

This report is a comparative analysis of the composition of squads of the eight clubs having reached the quarter-finals of the 2022/23 edition of the UEFA Women’s Champions League. It notably presents the average age of line-ups fielded by each team and their league of belonging, as well as the origins of the expatriate players active in the ten main domestic leagues worldwide.