No problem, Josip, I just got used on nordgens as synonym for fast growth players.
You can't find buyer for negotiations, but they can find you.
What you can is to make their job easier:
1) to train your player until he reaches one skill point less than X0 or X5; example - defence 60, attack 60, physical 59.8 or def 65, attack 64.8, physical 65 or
2) to find and add as friends token-rich players from lower levels (2-3). You can find them when you sell players (click on club who bought them) or
go on auctions, select 3* clubs, find some interesting player; examples: 2-3 position player, player with good SA, player whose Q is near next level (X4, X9)
Then after they accept your request for friendship, you can only hope some of them will check out your squad for possible singings.