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In Belgium's four-man back line, there is an embarrassment of riches when it comes to the two central spots and some concern on the wing.
When healthy, the central duo consists of Vincent Kompany and Thomas Vermaelen. That's two former EPL defenders of the year right there.
While both players have struggled with their clubs so far, they play far better for the national team.
Kompany leads the back line, but he's allowed to freelance and contribute to the attack. His goal against Scotland should give you an idea of what that looks like. He's the vocal leader of this team and one of the most experienced guys on the roster.
Vermaelen is not responsible for the entire defense (unlike at Arsenal) and instead can play unencumbered and do what he does best: use his vision and aerial prowess to stop the attack before it has even started.
The communication between both players is excellent, and the partnership has proven to be very fruitful. One thing that has been troublesome for the defense are quick strikes down the wing, where positional breakdowns on the crosses have happened, allowing too much space for the strikers.
Depth is provided by Nicolas Lombaert (top defender for Zenit St Petersburg), Jan Vertonghen (Tottenham), Daniel Van Buyten (Bayern Munich) and Toby Alderweireld (Ajax). Overall, this is an incredibly solid group with tons of depth.
The wingback are a different story, however.
The Red Devils lack quality backs, and as a result, Wilmots has decided to go with Vertonghen on the left and Guillaume Gillet (Anderlecht) and Alderweireld on the right.
Vertonghen currently also plays the LB position for Tottenham, but he is at his best in the centre of the defense where he can use his great vision. His pace is good but not great, and while he is capable of contributing to the build up, it is not his best feature. He's a good crosser but not a great one. Defensively, he is very solid.
Gillet is the regular starter on the right, but his natural position is in midfield. He's very good offensively, providing good crosses and finishing quite well with his head and his feet.
Defensively, he's a fighter that will not be intimidated by anyone, but he lacks the quality and experience to match up with world class players (even though he did a very good job against Gareth Bale of Wales).
Alderweireld is a CB like Vertonghen, but he is more limited offensively. He has more potential than Gillet, but the Anderlecht man has executed better so far.
Backup comes in the form of Laurent Ciman (Standard) and Olivier Deschacht (Anderlecht). Deschacht in particular is often not part of the final 23-man roster, to much surprise. He's another solid player, but he can only play on the left side, a position where Vertonghen seems the most logical choice.
Belgium has a strong defense with a lot of size and pace, but the wing backs are somewhat limited in what they can bring to the team. In terms of pure quality, you could make the case for the squad to be ranked top five in the world, but Vertonghen and Gillet need to master their respective position before I can have full confidence in this defense.