Hello top 11!
I think you should give managers the option to rent a player from a friendly manager.
For example I'm a manager level 5 with a good young team. My 11 best players are between 85 and 100%.
On the bench I have an older player who has 65% so I don't put him in the team.
I have an option to sell this player but maybe I can help a friendly manager for example level 4 with this player.
We can have an agreement to rent this player for one season.
Both teams talk about the price and for example they decide to rent this player for 2 million.
So I'm happy I got 2 Million! My player still gets stronger by playing games.
So i (level5) rent my player who has 65% to a friendly manager (level4) so this player is now an 85% player because he plays now in level 4 competition.
At the end of the season the player comes back to my team or both teams get to an agreement to sell the player.
Thanks!