German rag here (I come in peace :p), just curious about something.
Not necessarily related to KdB, but what's the point of handing in a transfer request? So the player tells his club he wants to move. Yeah, now how does that change anything or put pressure on the selling club? In the end it's still up to the clubs to agree on a fee. I have never heard of this concept outside the Premier League. When two clubs are negotiating, it's kinda obvious that the player wants out, isn't it?
On a related note, is this "permission to speak to the player" AFTER agreeing a fee a real thing? I could imagine a case where clubs reach an agreement after weeks of negotiating only to find out that the player is not even interested in a move. What's the case here is that usually the buying clubs reaches out to the player's agent, works out the contract details and then gets in touch with the selling club.