This is a cheat I stumbled across when i was playing the game.

First of all this cheat isn't a cheat that can change your whole game but it's qiute useful.

When you loan transferlisted players. The club that you loaned the player from has an asking price for that player. And when the player arrives at the club. you can change that players Asking price, to 0 or whatever you want to be the asking price.