Group F at this summer's World Cup will come to its conclusion on Wednesday.
Argentina and Nigeria face off in Porto Alegre, while Bosnia-Herzegovina and Iran meet in Salvador.
Argentina have already booked their place in the last 16. Bosnia-Herzegovina have been knocked out.
Nigeria could still win the group if they surprise Argentina, and Iran could still qualify with a win over Bosnia-Herzegovina.
FIFA might yet have to draw lots to decide whether Nigeria or Iran progress, should they finish level on points, goal difference and goals scored, which is still a possibility.
Here's a list of 10 factors that will determine what happens in Group F.