Borussia Dortmund are a side built around their midfield. Some teams have water-tight defences, some have forward lines that always seem to score one more goal than the opponents, but for this Bundesliga side, success starts with the men in the middle of the park.
Thomas Tuchel is clearly well-aware of this, considering the amount of time he applied to the area over the course of the summer transfer window. Not only did the new manager bring in two midfielders in Julian Weigl and Gonzalo Castro, but he also decided to clean up much of the roster by releasing Kevin Grosskreutz, Kevin Kampl and Jakub Blaszczykowski.