Messi's 8 goals raise Ballon d'Or hopes — can he win it playing outside Europe?

Lionel Messi has scored eight goals at this World Cup and delivered two key assists in the semi-final win over England, fuelling talk of a ninth Ballon d'Or. Historically, only once has the award gone to a player at a non-European club. Messi currently plays outside Europe, raising questions about whether the rules allow him to be eligible.