Denmark midfielder Christian Eriksen offered an unflattering analysis of his opponents, claiming Republic of Ireland's conservative tactics hinted at a fear stemming from their 5-1 play-off defeat last year.
Ireland played Denmark to a goalless draw on Monday, concluding their League B campaign with just two points,
Following the match, Denmark's star midfielder was critical of the style used by the opposition, blaming them for the dull draw.
"It was a difficult game to play," Eriksen said. "Ireland wasted a lot of time when they could and they rarely went forward. It was difficult to break them down.
"There was a lot of defending on their side. We were playing against 11 men in their own half. They have played like this in every game we've played.
"Of course, in the second game in Ireland, they wanted to go forward, but they know what happened when they went forward. Maybe that's why they're too scared."
Despite the result, Denmark went through on top of the group with eight points ahead of Wales' six.
Ireland may have been relegated in the Nations League, but Martin O'Neill is adamant his side will be competitive in the "games that matter".
"We've had in the four competitive games this season, I think, eight debutants, so players are getting used to playing with each other," O'Neill told Sky Sports.
"When it comes to the big games, I think the players will be ready. We've done it in the past. It's exactly what we've done in the past.
"We went into the Euros [in 2016] and we were very, very strong. We got to the play-offs in the World Cup too. We've been very, very strong when it comes to the games that matter."