NI clash in Portugal on radio and online
BBC Sport NI's Mark Sidebottom surveys the Estadio do Dragao in Porto where Northern Ireland will face the might of Ronaldo and his Portuguese team-mates.
BBC Radio Ulster will have live coverage of the Group F qualifier while there will also be commentary on the BBC Sport website.
Cristiano Ronaldo is set to win his 100th international cap in the game against the injury-hit Northern Irish.
WORLD CUP QUALIFIER GROUP F: PORTUGAL V N IRELAND
Venue: Estadio do Dragao, PortoDate: Tuesday, 16 OctoberKick-off: 20:45 BST
Coverage: Live on BBC Radio Ulster and commentary on BBC Sport website