Ulstermen Martin O'Neill and James McClean are fired up to floor Denmark at the Aviva Stadium tonight and blast Republic of Ireland to the World Cup finals in Russia next summer.
The first leg of the play-off finished scoreless but former Northern Ireland captain O'Neill is hoping his men, including Derry ace McClean can find a ruthless touch tonight.
"There is a terrific spirit in the camp," said boss O'Neill. "We've got to find a way to win. These players have been able to do that the last couple of years."