Germany and Switzerland are the only teams to have a 100% record in qualifying, though the latter could still have to use the play-offs to get to the 2018 World Cup finals. They have been chased close by European champions Portugal in what is the most top-heavy group. There are just three points between the Swiss and Portugal, though Hungary are a further 14 points behind in third and it has long been down to the top two to battle it out for top spot – the only guaranteed way to be one of the 32 sides in Russia next summer.

Currently Portugal, ranked third in the world by FIFA, will be in the draw for next month’s play-offs where they would be seeded. Despite having played a game less than most others, the Iberians are already the highest point-scorers in the ranking of potential runners-up. They have won eight of their nine fixtures, with their single defeat coming to Switzerland on matchday one last September.

With Cristiano Ronaldo in their side it is not a shock to see that they have scored 30 times already, while they have been solid defensively in Group B - shipping just four. This will all give Fernando Santos belief that his side can emulate the Spain team that won Euro 2008 followed by the 2010 World Cup. A win on Tuesday night would see them overtake their opponents into top spot courtesy of their superior goal difference.

Switzerland are, of course, very much in a commanding position and can afford to head to Lisbon in a defensive frame of mind. This could play to their strengths as they have conceded just five times in nine games.

Tipbet have a plethora of football odds on offer for this and every international fixture, including the play-offs next month. In what is the Group B decider Tipbet have Portugal as favourites to win the group. They are 1.40 to overtake Switzerland, with their opponents 1.85 to stay top. That, of course, would be made possible with a draw (3.80). To win on the night Portugal can be backed at 1.65, with their visitors 5.75. Despite their long odds, Switzerland have been impossible to beat and there is no guarantee that this will change on Tuesday. Over 80 markets are available for the 20:45 (CET) kick-off.