Joe Prince-Wright, Liverpool's Joel Matip: "I have no doubt about our way of playing", su NBC Sports, 21 settembre 2017. URL consultato il 24 luglio 2018.
«He graduated from the now famous Gesamtschule Berger Feld school which has German internationals Mesut Ozil, Julian Draxler, Manuel Neuer and Benedikt Howedes among their alumni.»