Most fielded U21 players in the big-5 leagues

Issue number 138 of the CIES Football Observatory Big-5 Weekly Post presents the 10 most fielded U21 players per position. French Ligue 1 footballers are the most represented, while English Premier League players are the least numerous. However, Anthony Martial (Manchester United) tops the table for forwards, while Héctor Bellerín (Arsenal) heads the full back ranking.
The U21 footballers listed below have played the highest percentage of minutes per position. Among them are notably two Schalke 04 players: Leon Goretzka and Maximilian Meyer. The latter footballer outranks his teammate Leroy Sané among attacking midfielders. The full tables are available here.
Goalkeepers
Gianluigi Donnarumma (Milan), born in 1999, 68.0%
Centre backs
Niklas Süle (Hoffenheim), born in 1995, 100.0%
Full backs
Héctor Bellerín (Arsenal), born in 1995, 92.3%
Defensive midfielders
Leon Goretzka (Schalke 04), born in 1995, 82.5%
Attacking midfielders
Maximilian Meyer (Schalke 04), born in 1995, 78.8%
Forwards
Anthony Martial (Manchester United/Monaco), born in 1995, 89.6%