URGENT : 21 players in my team .. 2x u21 players to come tommorow

[July Fourth]

can someone who's signed an U21 player before tell me if they perform well ? because i dont want to be spending 24 tokens on someone thats going to achieve 5's or 6's every match otherwise its a waste of a load of tokens

They are good, but you need to be investing your green boosters for training into that U21 youth player to make him a good player.