Iceland's players rushed to the stands to share their celebrations with their fans and now will have real belief that they can get out of Group D that also contains Croatia and Nigeria, who meet later on Saturday.
Finnbogason had made a hash of a header seconds earlier but Argentina failed to clear and Willy Caballero could only palm Hordur Magnusson's shot into the path of the striker, who gleefully turned it home. The game then looked like it was heading towards a stalemate until Iceland conceded a penalty with half an hour remaining on the clock.
ALSO READ: Focus on Messi as Argentina begin World Cup campaign against Iceland Accompanied by Torino full back Nicolas Tagliafico, Sampaoli's willingness to share team secrets spoke volumes about the confidence Lionel Messi has inculcated in the team.
We'll score our experts just as we do in the Match Predictor - 10 points for correct result, with a bonus 20 points for getting the scoreline right too.
Messi has missed four of the last seven penalties that he has taken for Barcelona & Argentina combined (57%).
Ian Wright was shell-shocked... "It was the advantage", Messi said.
"I had a feeling that he could go that way".
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Despite dominating possession and creating the majority of the chances, Argentina didn't win its opener against Iceland, drawing 1-1.
His first game in the 2018 World Cup in Russian Federation is against Iceland on Saturday, June 16 at 9 a.m. ET.
Russian Federation is holding its first time ever edition of the FIFA World Cup, which kicked off in Moscow with a spectacular opening show at the Luzhniki Stadium on the night of June 14.
"He was informally interviewed by Arsenal before they appointed Unai Emery and I think Chelsea would the kind of job that would interest him".
Playing in their very first tournament, Iceland are not expected to worry Argentina that much, but they are capable of an upset as shown by their defeat of England in Euro 2016.
Last but not least, we get to see Croatia and Nigeria for the first time.
Accusing Argentina of over-reliance on Messi may seem unfair to a team boasting the sharp attacking talents of Sergio Aguero, Paulo Dybala and Gonzalo Higuain but it is a view coach Jorge Sampaoli himself has expressed.
"I think the Argentinians felt a bit frustrated that they weren't getting through and it was important we equalized so quickly". We just started and we know it won't be easy.