Group B, Basel: Fabian Schar
Swiss side FC Basel face a really tough task to make it through their group phase and into the knockouts, so the performances of key centre-back Fabian Schar will be of the utmost importance.
In truth, it's a surprise that a club from a bigger league didn't come in for the young defender during the transfer window, but his continued presence is a massive bonus for Basel.
He and the rest of the defence will have to be at their best if the Swiss side are to have a chance of progressing past the group stage.