France's Antoine Dupont receives treatment after taking a knock to the head during the Rugby World Cup Pool A match against Namibia at the Stade de Marseille in Marseille, France. AP
France's Antoine Dupont receives treatment after taking a knock to the head during the Rugby World Cup Pool A match against Namibia at the Stade de Marseille in Marseille, France. AP

France 'extremely concerned' as Dupont suffers possible jaw fracture