Issue number 240 of the CIES Football Observatory Weekly Post presents the ten most fielded U21 players in the big-5 leagues and Portuguese top division. Until last Friday, eleven U21 footballers had played the totality of domestic league minutes. Among them notably are hot prospects such as Rúben Neves, Jules Koundé, Arne Maier, Nikola Milenković and Rúben Dias.

Up to six goalkeepers are to be found in the top 10 rankings: Emil Audero (Sampdoria), Gianluigi Donnarumma (Milan), Paul Bernardoni (Nîmes Olympique), Florian Müller (Mainz), Alban Lafont (Fiorentina) and Unai Simón (Athletic Club). With four representatives, FSV Mainz is the most represented club overall: Aarón Martín, Jean-Philippe Mateta, Florian Müller and Ridle Baku.

Overall, footballers born on or after 1st of January 1997 have played 15.4% of total domestic league minutes in the French Ligue 1, 14.7% in the German Bundesliga, 9.8% in the Italian Serie A, 6.1% in the Spanish Liga, 5.3% in the English Premier League and a mere 5.0% in the Portuguese Primeira Liga. The average age on the pitch per league and club is available in the CIES Football Observatory Demographic Atlas.