Oh oh! Cristiano Ronaldo & Portugal could miss out on 2018 World Cup

It's no longer news that Lionel Messi's nation, Argentina, are in dire danger of missing out on Russia 2018 World Cup qualification, but few football followers are aware that his rival, and current World footballer of the year, Cristiano Ronaldo, could also miss out on the show piece  event happening next summer.
Portugal, who shocked the football world to win Euro 2016, are on 24 points while Switzerland are on 27. They host Switzerland on Tuesday and must win to qualify automatically. Portugal have heavily relied on Ronaldo and know that their World Cup fate is in their own hands.
On Saturday, Ronaldo came off the bench to inspire a win over Andorra that kept their automatic qualification hopes alive. Can Ronaldo once more be his nation's savior