Following their 0-0 stalemate in the first leg on Saturday, both sides will be expected to be attack minded and jettison their defensive approach.
They have a lot to play for in this outing. For the Irish team, they last featured in the prestigious tournament in 2002 while the Danes have missed the last three editions of the competition - an indication that both teams will be desperate for victory in this crucial encounter.
The Green Army have not been impressive on their turf recently, having won just two of their last six home games. LionsBet has tagged them as slight underdogs for this clash at odds of (2.85) and odds of (2.30) is available for them to nick a place in Russia next year.
Six of the past 14 meetings betwenn these two has ended in stalemates and (2.80) is on offer for a repeat of this at the end of 90 minutes.
For the Danes, though they are on the back foot on head to head with their host. Their away record has however been impressive lately, going three games unbeaten outside Telia Parken. The betting firm is offering them at a narrow (2.60) to come out on top and (1.50) is up for grabs for them to secure a place at the global football showpiece for the first time since 2010.