No team during current big-5 league season fielded club-trained players for a greater percentage of minutes than Athletic Club: 55.8%. The Basque side outranks local rivals Real Sociedad (43.9%), while Celta Vigo (41.2%) complete an all-Spanish podium. The Slovaks of MŠK Žilina (85.5%) top the table for clubs from 40 leagues worldwide. The data for all clubs is available in the 378th CIES Football Observatory Weekly Post.

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Editors:
Raffaele Poli
Roger Besson
Loïc Ravenel
Thomas Gonzalez

The Colombians of Envigado (76.4%) head the rankings for the nine non-European leagues included in the study, ahead of four Argentinean teams (CA Banfield, CA Lanús, Rosario Central and CA Unión) and the Brazilians of Corinthians (56.3%). Club-trained footballers are defined as players who have been at their employer clubs for at least three years between the seasons during which they celebrated their 15th and 21st birthday.

At league level, the figures stretch from a record-low of 4.0% in the Greek Super League to a record-high of 26.0% in the Argentinean Liga Professional. On average, teams from the 40 leagues surveyed fielded club-trained players for 15.0% of domestic league minutes. Among the 42 teams who did not use club-trained footballers notably are Brentford, Bayer Leverkusen, Bologna and Udinese. More exclusive information on clubs from 31 European top divisions is available for free in the CIES Football Observatory Demographic Atlas.