"It is true that the coach organises the team but the footballers create the opportunities on the pitch and if you have players like Messi then the coach has to organise players around him to take advantage of his unbelievable skills", he said. He was the first ever professional Icelandic footballer and the second ever foreign player to line up for the Gunners.
While Hallgrimsson got his approach spot on, the same can not be said for his Argentina counterpart Jorge Sampaoli, whose pre-match assertion that everything would be centred around Lionel Messi seemed to upset the balance of his side. Messi placed his shot to the right of Hannes Halldorsson, but the Iceland goalkeeper dived and got two hands behind the ball. Against a team like Argentina, it's just a fact: They have better players.
They may not be cocky, but after passing one of their first competitive tests against a top-ranked side from outside Europe, the Icelanders aren't short on confidence, either.
Messi said Iceland's tactic's made it hard for his side claiming "they did not want to play" but admitted that Heimir Hallgrimsson's team "closed well".
"Worried? No, I'm angry and it hurts because I missed the penalty".
Although there was no missed penalty, Portugal could only muster a 1-1 draw and Ronaldo failed to score from 10 shots on goal. Truth be told, Messi seemed to be spurred into life after that miss, dribbling with objective and creating more chances for himself - an exquisite over-the-head take of a through ball in the 79th minute was jaw-dropping - but try as he might he couldn't break the Iceland defence down. While Messi's penalty was the biggest chance missed today, there were other factors too which contributed to Argentina's dismal performance today. Birkir Bjarnason pushed wide his near post effort.
The score was already 1-1 when Argentina was awarded the penalty after Hordur Magnusson's tumbling fall over Sergio Aguero as both chased Messi's floated cross. "It could have given us the lead and that could have changed the match", Messi said.More news: Ryan Fox tied for 20th, four shots off leaders at US Open
If you are an Argentina fan, maybe that's a good omen.
"Meza is the person we have been looking for, he's very versatile and allows us to recover balls". And with the group favourite out of the way, they can turn their attention to beating Nigeria or Croatia for a chance to reach the round of 16.
"Maybe we needed to be more creative in the first half".
Argentina face Croatia next on Thursday at the Nizhny Novgorod Stadium (19:00 BST).
In what could be considered the World Cup's first upset, Iceland have held Argentina to a 1-1 draw in the first Group D of World Cup 2018.
"It's a strong team we're meeting tomorrow but our staff have done their analysis", he said.
As we know, Portugal fought their way to glory two years ago and so Sampaoli's men can console themselves with the thought that teams can recover from an opening-game setback to go far. "I think this offensive creativity can give Argentina opportunities to move on to the next stage".