-Play as Arsenal and purchase Robert Pires for £17.5M. After acquiring him, go to find player, type "Pires", and Robert Pires with a different club and only worth £75,000 will appear. Purchase him and Man Utd will place a bid for the more expensive Robert Pires at a price of £23M. Accept and Pires will go to Man Utd, but leave you with a profit and the other Pires.
-Have a rich club such as Manchester United or Barcelona, then purchase players from the club you want to make richer. e.g. St. Johnstone (Scotland) Gerry McMahon for 7.5m, Nathan Lowndes 6m etc.
-Make a bid for the player with a cash price, and no exchanges or money after appearances. Once the bid is accepted, click on the player's name at the contract stage. Then, go to transfers, click on your bid, and withdraw it. Immediately make a fresh bid for £0 and offer it. Then, press "Back" to return to the contract stage. Offer a contract as normal and if the player accepts it, you will get him at no cost.
For example, to get Ronaldo free, add manager as Inter Milan, release Ronaldo on a free transfer, and retire from the club before they cancel the transfer. Go another club and sign him for free.
Go to "Add Manager" and edit your name, then go to any squad. Click on a player, then click on their nationality (e.g. Ryan Giggs - Welsh). This give you the national squad. Go to the top right hand corner, click on "Take Control", then click "Yes".