#9 Christian Gourcuff
League minutes played by U-23 players: 19.1%
The Frenchman is another football manager who is known for two things - playing a brand of attacking football and trusting youth players.
In the last decade, Gourcuff has managed Lorient and Rennes in Ligue 1 and has spotted a number of players who have gone on to become stars in club football.
A few famous youngsters he has managed in the past include Arsenal defender Laurent Koscielny (who is now the team's captain when Per Mertesacker is unavailable and a permanent member in the France squad).
Striker André-Pierre Gignac (who has 36 caps for France) also came through the youth system when he was Lorient manager) and Atletico Madrid striker Kevin Gameiro (who helped Sevilla win three consecutive Europa League titles) are two other attacking players who thrived under the veteran manager.