Thanks!
This is for players only. The club can still outright reject the loan proposal (usually "we want players to play at a higher standard").
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Overall, I feel this could be improved so it is a bit more user friendly, convenient and efficient.
The feature already exists in the game to a certain extent as when you are initially offered the clubs to select as a senior affiliate, the clubs will list players that they are willing to loan to you. You should be able to ask for this list of players each season/window.