After Saturdays draw in Copenhagen, the whole country will be on the edge of their seats praying that our Boys In Green can qualify for The World Cup.
Here's all you need to know ahead of Republic of Ireland's biggest game in years.
Kick off for tonight's second leg is 7:45PM and will be live on RTE 2.
Heading to the Aviva?
If you're lucky enough to be heading along to the Aviva, alongside 50,000 others you might want to get there with plenty of time to spare.
Ahead of @FAIreland v Denmark tomorrow here are the bag dimensions and the opening times.
KO is 19.45, safe travels to all. Enjoy the match! #IREvDEN pic.twitter.com/ptWBVawoF6— AVIVA Stadium (@AVIVAStadium) 13 November 2017
Tonight's Weather:
Weather wise, Met Eireann predict that there will be patches of drizzle and mist overnight, but hopefully not as bad as the 2015 Ireland V Bosnia match.
Well this is a good game to watch! ðŸ™ˆðŸ˜‚âš½ï¸ #fog #BIHIRL pic.twitter.com/ZCQDLw2J3P
— Christie Buchanan (@Christie3B) 13 November 2015
Additional train services have been added ahead of tonight sold out game.
Additional services added for @FAIreland fans travelling home from @AVIVAStadium tonight - Book Now https://t.co/r50m2431AZ #IRLDEN #COYBIG pic.twitter.com/xMI8JNKUHP
— Iarnród Éireann (@IrishRail) 14 November 2017
Tonight decides our World Cup destiny. Come On You Boys In Green!
📆 Tuesday 14 November
â° 19:45
ðŸŸï¸ @AVIVAStadium
⚽ Denmark 🇩🇰
🆠@FIFAWorldCup Play Off
📺 RTÉ 2
📱 @FAIreland #COYBIG 🇮🇪 pic.twitter.com/5ahgQYl6qh— FAIreland âš½ï¸ðŸ‡®ðŸ‡ª (@FAIreland) 14 November 2017