Press R3 anywhere to get the cheat menu.
if you want to get any player you would like then simply go to the iformation screen and select comparisons. You can choose any 1 of your players to be swapped with a player of another side. example.. if you are chelsea and wish to buy Paul Scholes from Manchester United you would pickChelsea player(Oliviera), then choose a player from another team(Scholes). click square to swap the players. This brings up a negotiation screen, negotiate with the other team immediately. it will cost you usually about £500,000. go to the team menu and select lineup your new player will be in your reserves.