Despite Messi's penalty being saved by Iceland goalie Hannes Halldórsson, the Argentines are coming in to this game with even more fire than anticipated.
Jorge Sampaoli's men must beat Croatia if they want to secure a spot in the knock-out stages. But with Croatia on a high after an easy 2-0 victory over Nigeria, the Argentines must come prepared.
There is a chance that Croatia could turn out to be the real underdogs of the tournament, but only time will tell.
Follow all the live action below...
Please allow a moment for the blog to load...
What time is it?
Argentina vs Croatia kicks off at 8pm.
Where can I watch it?
The game will be shown live on BBC One.
Argentina 1 - 2 Croatia. While Argentina are a World Cup favourite, relying on Messi just might not be enough. With Croatia's gumption and confidence, they have a standing chance to secure their spot. The tournament dark horses might surprise us all.