Hello, thank you for loaning my player XXX. Here are some rules you should follow.
1,Play as many friendly matches as possible.
2,Play all league matches, national cup, and U21 cup.
3,If possible, don't let him play U21 matches until he has got the maximum possible EXP from matches(League matches give more than U21). After that you can let him play U21 matches as well.
If the player has injured, feel free to PM me.