After losing their first game in Russian Federation against Croatia, the Super Eagles will face Iceland this afternoon, June 22, and only a win will give them the chance to make the round of 16.
Fortunately for Argentina, the squad will still have a chance to sneak into the knockout round, barring a massive rout in Friday's Iceland-Nigeria game - but Messi's team will have to play much better in its group stage finale than it has so far in Russian Federation.
Iceland were pressuring Nigeria towards the 65th minute as they went in search for an equaliser, but they lacked quality in the final third.
This is Iceland's first ever appearance in the World Cup.
They will now face Argentina on Tuesday, hoping to book a place in the knockout rounds.
Croatia: With two wins - over Nigeria and Argentina - they bagged six easy points to qualify for the round of 16 for the first time since 1998, when the Balkans had finished third in the tournament in France.
"Musa now added to it with his speed, and this changed the game for us. You can ask this question again after the game, but I will tell you we will not lose", he said.
Croatia top the group after 2-0 and 3-0 wins against Nigeria and Argentina respectively, but Hallgrimsson is undaunted.
The Super Eagles were on the front foot early on but they could not create clear-cut chances, while Gylfi Sigurdsson forced Francis Uzoho into two saves in the opening five minutes.
Some picked up on the fact that Musa had notched a double against an Icelandic defence that Messi had failed to breach in Argentina's group game - when he missed a penalty - and Cristiano Ronaldo hadn't managed in Portugal and Iceland's Euro 2016 encounter. "It gave us more space and the speed proved decisive for us".