The 2010-11 campaign for Feyenoord was a dramatic and turbulent season of underachievement as De club aan de Maas ultimately slumped to a 10th-place finish in the Eredivisie. The year was defined by the stunning emergence of young centre-forward Luc Castaignos, whose 15 goals proved crucial, but also by the historic and humiliating 10-0 defeat to rivals PSV Eindhoven, the worst loss in club history. Despite the turmoil that saw manager Mario Been depart, the passionate home crowd at De Kuip, with an average attendance over 42,000, stood by a young squad featuring future stars like Georginio Wijnaldum and Stefan de Vrij, marking it as a painful but pivotal chapter in the club's rebuilding.