The 405th edition of the CIES Football Observatory Weekly Post ranks 417 teams from 27 European top divisions according to the percentage of minutes played by club-trained footballers, i.e. present for at least three years between the seasons of their 15th and 21st birthdays. The highest proportions were measured for the Slovakians of MŠK Žilina in total (73.3% of minutes by 16 players trained) and Athletic Club in the big-5 (56.6%; 13).

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Editors:
Raffaele Poli
Roger Besson
Loïc Ravenel
Thomas Gonzalez

Club-trained footballers played a majority of minutes for only one other team in the five major leagues: Olympique Lyonnais (52.2%; 11 "trained"). Real Sociedad rounds out the podium for the big-5 (40.2%). Chelsea and Brighton & Hove top the list in the English Premier League (26.9%), SC Freiburg in the German Bundesliga (31.0%), AS Roma in Italian Serie A (17.8%), as well as SL Benfica in the Portuguese Primeira Liga (25.8%).

Thirty-three teams are at the bottom of the ranking with no player trained fielded in current season’s domestic league matches. Among them are 11 big-5 league clubs: one from Ligue 1 (Olympique de Marseille), one from the Premier League (Brentford FC), one from the Bundesliga (Union Berlin), three from the Liga (Cádiz, Getafe and Almería), and five from Serie A (Bologna, Lecce, Udinese, Cremonese and Salernitana). The data by league is available in the Demographic Atlas.