Research shows why Chelsea's super academy might only be as productive as Sochaux and Empoli's, and much more
Research from the excellent CIES Football Observatory has evaluated the most productive training clubs across Europe (defined by UEFA as having tutored players for at least three seasons between the ages of 15 and 21 who then go on to play in the top-five leagues).
It's particularly good news for Athletic Bilbao and Real Sociedad, two of La Liga's Basque representatives who are not only producing players at a healthy rate but also keeping hold of them for their first team too.