Toby Alderweireld and Jan Vertonghen were arguably the best centre - back pairing throughout the 2015 - 16 season .
Though their quality is still evident , they 've not looked as solid so far this season .
Toby Alderweireld and Jan Vertonghen were arguably the best centre - back pairing throughout the 2015 - 16 season and though their quality is still evident , they 've not looked as solid so far this season .