Russia 2018 is coming closer after each passing day, and there are a few large countries who absolutely cannot afford to slip if they hope to qualify.
Portugal
The decisive victory against Hungary notwithstanding, Portugal haven't been able to show the form that won them Euro 2016.
The Netherlands
Danny Blind made a horrible mistake in starting a 17-year-old center back against Bulgaria, and the Netherlands paid for his mistake with a loss. Netherlands had some issues in defeating Belarus, as well as Luxembourg in their previous two matches.
Scotland
This is about the last chance that Scotland will have if they have any hope whatsoever to make the qualifications for the upcoming world cup tournament. They will play host to Slovenia, and they will absolutely need a victory to keep pressure on England. The Scots currently sit in fifth place in their group, and with a win they can pull to within one point of the English.