In Franchise mode off-season, after you re-sign your players save the game. Enter Free Agent mode. If you do not like the free agents available (for example, if you need a top wide receiver and there are none), reload the game until you like the players that are available. You can also do this to make your division easier. For example, if you are the Jets and Randy Moss goes from the Patriots to the Rams then you do not have to worry about facing a player like that twice a season.