Denmark were well up for the physical challenge posed by World Cup playoff opponents Ireland in Saturday's scoreless draw in Copenhagen, and they won't be intimidated in the second leg in Dublin either, defender Simon Kjaer has told Reuters. "These players have been able to do that the last couple of years".
O'Neill stressed Ireland would use the experience of previous big home wins against Germany and Bosnia and Herzegovina - as well as the raucous Lansdowne Road crowd - to try and play the slightly more assertive game they need to go through. I think Ireland are going to the World Cup. We have also fought back in matches when we've been behind.
That'll be easier said than done.
O'Neill's side has been vaunted for its durability rather than its easiness on the eye with Denmark midfielder Thomas Delaney admitting trying to break them down was like attempting to "open a can of baked beans with your bare hands". It's shame that, when I came in, Robbie Keane was the same age as me!
"We haven't had that and we have to try and find other ways to do it".
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I'm actually quite surprised by Denmark being odds-on for this first leg.
"Of course there are moments in the game where they will get frustrated with us. but I think they realise that the side is really well meaning and the one thing that I can absolutely guarantee from the players is that they have given absolutely everything - everything, you couldn't have asked for any more".
However, O'Neill knows from experience that all the preparation in the world can not replicate that moment, illustrating his point by reference to the 1984 European Cup final in which Roma's Falcao and Toninho did not step up for a shoot-out against Liverpool.
"I believe in the manager, I believe in the players, I believe in all the backroom staff". They know that they can't play a match where they have to stay so deep.