The following are known Action Replay Codes for FIFA 99 on Nintendo 64 (N64).

Device Compatibility: Action Replay & GameShark

Team on the left of score board has 10 goals
800375C7 000A

Home team scores 0 goals
30034D40 0000

Away team scores 0 goals
30034D44 0000

Away team scores 10 goals
30034D44 000A

Team on the left of score board has 0 goals
800375C7 0000

Team on the right of score board has 10 goals
800375C3 000A

Home team scores 10 goals
30034D40 000A

Team on the right of score board has 0 goals
800375C3 0000