It depends when you get them in the season. If you get them in the beginning its worth it to hold onto them and build them up first before you get rid of them
even at the end of season is fine as they are only 19 so can still train new season as player`s are looking for young player`s
15 Titles
10 Runner-up
5 Champions league
2 Runner-up
4 Cups
2 Runner-up
1 Treble