UEFA U21 Cards . Up to date UEFA U21 player disciplinary recordsWant to see which teams and players have had the most red and yellow cards in the UEFA U21 this season? Here you'll find all the up to date UEFA U21 red cards and yellow cards, player disciplinary records. All the details are below for you! If you're placing a bet on booking points or a specific player to be carded, then this is the place to get an accurate insigght for player card bets.