In FIFA 09, players can be bought and sold to improve the quality of the team. This can be done in a number of ways, including the transfer market, the auction house, and by scouting players.
The transfer market is the most straightforward way to buy players. Players can be searched for by name, position, or club, and their prices will vary depending on their overall rating and potential. The auction house is a more competitive way to buy players, as players are bid on by other users. This can lead to players being sold for much more than their market value, but it can also be a good way to get a good deal on a player that you want.