i think you can just go to your rosters and call someone up from AAA or AA and then add them to all of your line-ups (vs righty w/ dh, vs righty w/o dh, vs lefty w/ dh, vs lefty w/o dh) and once you get those all filled out with 25 players you should be good to go. if not go to the free agent screen and sign someone. i used to play 05 so idk if its the same as 04 the game cube.