No team during the 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.
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.
About the CIES Football Observatory
The CIES Football Observatory is a research group created in 2005 within the Swiss-based Centre International d’Étude du Sport (CIES). It specialises in the statistical analysis of football, in particular in the areas of demographics, transfer values and performance. Click here for more information.
About the CIES
The International Centre for Sports Studies (CIES) is an independent study centre located in Neuchâtel, Switzerland. It was created in 1995 as a joint venture between the Fédération Internationale de Football Association (FIFA), the University of Neuchâtel, the City and State of Neuchatel. Click here for more information. Click here for more information.
CIES – Centre International d’Étude du Sport
Avenue DuPeyrou 1, 2000 Neuchâtel
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