Go to the player buy screen. Select to buy a player over 6m and put the money offered down to 0. Select the bottom player on the opponent's team as long as he's under 1.9m. Next select a high-priced player of yours that the opposite team would accept the exchange for. Comfirm the offer and suprisingly you will have the 6m+ player you selected and still have your player. You can do this cheat three times and then you will lose your player.