Go into the files included with the game to find a game database editor. Start it, then click on "Edit players/Clubs". Go to a country, and then a team. Click on "Players" and select "Edit Player". Click on "Player Skill" and change every skill to 255. Once done, change his age to 24. Next, go back to the main menu and select "File", then "Export". You do not have to save the file, but if your computer crashes you will keep the information. Then, start a new game. The player you changed will have 99 skill. He will cost quite a bit of money to buy him -- move him to the desired team instead.