RTÉ have released their viewing figures for the game and they were massive - an average audience of 924,300 people watched the match with the peak figure reaching 1.12m.
The Juventus forward netted in the 109th minute to complete a remarkable comeback from a shattered Croatian team and take the small nation of little more than four million people into the World Cup final for the first time in their short history.
Kane looks set to claim the Golden Boot as the World Cup's leading scorer, but the Tottenham star rarely looked like adding to his six goals against Croatia.
For a team who have been consistently well-organised and effective throughout this tournament, it was a unusual state of affairs but crucially they were able to turn it around and England had no answer.
The second semifinal takes place on Wednesday between England and Croatia.
Zlatko Dalic's men were often compared to the 1998 FIFA World Cup Third Runners-up Croatia as that squad has been the best team they have produced for the worldwide tournament.
"Apparently penalty kicks when players are pushed inside the area are only for England".
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They then went on to comfortably beat Sweden 2-0 in the quarter-final before taking the lead in the semi-final with a wonderful Keiran Trippier free-kick early on.
He was also asked about his own path to the final, having left Croatia in 2010 to coach a new side in Saudi Arabia. Croatia's last two games went into extra time, which will surely play a factor in fatigue over the period of the game.
But there has to be more than that for a team playing in the semi-final of a World Cup.
Vrsaljko cleared a John Stones header away from in front of the line, but England had Pickford to thank for a brilliant save as Mandzukic connected with a devilish Perisic cross.
Harry Kane did try to play in a deeper role but after Croatia equalised, England were hoofing the ball and hoping for the best.
It is the first time since 1998 that Croatia have reached this stage.
How he featured in all England matches beggars belief.
The only English player with any kind of imagination, Sterling with his pace and ball control kept the Croatian defenders busy.