Republic of Ireland boss Martin O'Neill rued missed chances after his side were thrashed 5-1 by Denmark in their World Cup qualifying play-off.
The playmaker was the youngest player at the 2010 World Cup, where Denmark exited at the group stage, but more performances like this could see the Danes spring a surprise in Russian Federation.
The Danes, who were frustrated by the well-organised Irish in a scrappy goalless first leg in Copenhagen, fell behind to a Shane Duffy header after seven minutes but soon struck back.
The Danes booked their ticket to Russian Federation with a brilliant 5-1 win in Dublin, Eriksen's treble sandwiched by a Cyrus Christie own goal and Nicklas Bendtner penalty after Shane Duffy had put the hosts into an early lead.More news: Uber in trouble again with class action lawsuits from USA riders
And with that heroic performance, Denmark qualifies for the World Cup for the first time since 2010.
The former Republic of Ireland global was highly critical of manager Martin O'Neill who selected a diamond formation against Denmark, a change from his defensive five-man midfield which played in Copenhagen on Saturday.
"We were well beaten in the end".
"It's a insane feeling right now, we've been fighting together for so long", Eriksen said.More news: Advanced 'Justice League' tickets are outpacing Wonder Woman's sales
There was time for another goal for the visitors when they awarded a penalty in stoppage time. "We obviously got off to a great start and perhaps James second goal (had he scored) might have made a big difference in the game", he said.
"We can not ignore that Eriksen delivered an incredible performance and probably played his best worldwide game, in my opinion", Bendtner told reporters.
"There is two-on-one for a corner and Harry gets beaten but we should still be able to clear the ball and we haven't done that and the next goal is a comedy of mistakes". We were more effective than in Parken, the effectiveness is very important in football.
Not surprisingly, McClean, one of Ireland's better performers on the night, was distraught at the end of the game.More news: GameStop halts its unlimited used game rental program
Despite the defeat on Tuesday night, many will eventually reflect on the positive nature of the qualifying campaign which saw them finish second in a group they were seeded fourth in, getting the better of Austria and Wales to make it to the play-offs. I take the more clinical shot rather than passing.
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