Toby Alderweireld and Jan Vertonghen will likely be Wilmots ' two central defenders .
Marc Wilmots has puzzle to solve in the first games to work out which back four combination is the best option .
Toby Alderweireld and Jan Vertonghen will likely be Marc Wilmots ' two central defenders .
Marc Wilmots has puzzle to solve in the first games to work out which back four combination is the best option .