Premier Manager 2003/2004:
During a match on the match screen with the 2d match view.
You must be focused on the match view tab at the top left of the screen.
These codes are not saved so you will need to re-enter them when you load a game.
Press RETURN 10 times quickly
Cancels all other match day cheats. Text will glow blue to confirm.
-from bencarter
Press RETURN 20 times quickly
Guaranteed draw. Neither you or your opponent can score. Text will glow yellow to confirm.
Press RETURN 25 times quickly
You cannot score. Text will glow red to confirm.
Press RETURN 15 times quickly
Your opponents cannot score
against you. Text will glow green to confirm.