http://www.netrover.com/~timt/cheats/m/manchesterunited.html (Amiga Plus Extra No. 5/97, 05/1997)If you're losing a game, whilst playing simply press the appropriate key to start a two player game and the other team should freeze letting you win kind of easily.
When you concede a penalty push the joystick up and keep the button pressed down and your goalie will always save it.
During play press 'CTRL' and 'ESC' simultaneously to loose with 5-0.