They're on opposite sides of the tournament, so they either never face each other, or they face each other in the final.
There's not a chance to see a semi-final with Argentina vs Portugal.
Either the final or nothing.
But the fact that they are on the opposite side of the groups, they can face each other in the semi finals. And there are two possibilities for this to happen:
- Argentina pass in first place of the group, and Portugal pass in second place.
- Argentina pass in second place in the group, and Portugal pass in first place.
Note the strings:
