To celebrate its twenty years of existence and pay tribute to the clubs developing the talent that makes us love football, the CIES Football Observatory is very proud to present a study of the teams that have trained* the most players fielded in Europe's big-5 over the last two decades. The top three are Real Madrid (166 players), Barcelona (156) and Paris St-Germain (111).
Olympique Lyonnais and Manchester United (both with 103 players) are at the foot of the podium, followed by Stade Rennais and Atalanta (94). Among the teams outside the big-5, the three having trained the most footballers who have played in the five major leagues since 2005/06 are Ajax (73 players), Sporting CP (64) and River Plate (51). Boca Juniors (49 players) and Benfica (45) are also in the top 5.
To celebrate twenty years of hard work, the CIES Football Observatory research team has also prepared a more in-depth study, published as the 99th Monthly Report, notably including details of the footballers trained by team and a map of all the big-5 clubs in which they have played. Enjoy the read and thank you for your interest!
* Training clubs are defined as the first teams where footballers have played for at least three years between the seasons of their fifteenth and twenty-first birthdays (seasons of these birthdays included).
Main training clubs for players fielded in big-5 leagues since the 2005/06 season
Domestic league matches played between 01/07/2005 and 31/01/2025