In a group alongside Croatia and Nigeria, who play later on Saturday, it's difficult to predict who will emerge. Argentina are the favourites to top the group but second-spot is certainly up for grabs. If Iceland get a result today, it will be wide open.
Gylfi Sigurdsson is Iceland's biggest attacking threat, boasting 19 goals, but they will have to be strong defensively. That could leave Finnbogason, leading the line, feeding on scraps and the central midfielders will have to get stuck in to quell attacks from the back. Gunnarson, Iceland's skipper, could be crucial.
While Messi may be the star of the show, it would be incredibly unwise to deem Argentina as a one-man team.