Portugal

Portugal arrive at this tournament with possibly the world's best midfield trio in Vitinha, João Neves and Bruno Fernandes. They also very well may have the best full-back pairing in Nuno Mendes and João Cancelo. It should follow that the task ahead of Roberto Martínez is, in theory, a tap-in - with players of this calibre, just let them take the pitch and execute the routines that the trio from PSG perform in club football (though history shows us that this kind of thing doesn't always come easily to Martínez). The other areas of the pitch may require a bit more brainpower. Bernardo Silva remains an elite midfielder, but deploying him deep (as he has done for City, but not so much Portugal) instead of Neves would be controversial. More likely, he'll be forced onto the right, and a diamond-like shape forms in possession.

The left wing spot is even more up in the air. Rafael Leão hasn't had his best season and picked up a bizarre red card in the latest friendly. Pedro Neto is in spotty form as well. Gonçalo Guedes isn't quite the star we imagined he could be, but he brings a diligent workrate and some scoring ability. João Felix has been in top form for Al-Nassr, but his positional fit isn't clear. And yes, Cristiano Ronaldo will probably start most games up front, where the theory is that his movement in the box and set-piece upside can compensate for the out-of-possession difficulties that stem from his presence.