To get a player for free all you have to do is this:
1.Put a stupid offer in for them (like 50million)
2.When/If its accepted go to the offer contract screen.
3.Then click on the players name at the top of the screen (the small writing not the big writing)
4.Withdraw your offer
5.Then put in a new offer
6.Then if you press the back up arrow (top left of screen)it should bring you back on to the contract offer screen
7.Then offer the contract and if the player accepts when you confirm the signing it will be for free.
Its a lot easier than the other peoples cheats