After suffering a devastating loss in 1990, Hopp decided to invest money into his former club, which was playing in the lowest tiers of the German football league system (Kreisliga) at that time. Due to his financial aid, the club became a major force in the region by the early 2000s, reaching Germany's third division (Regionalliga). In 2005, Hopp massively intensified his investments and aimed for the promotion to the Bundesliga, Germany's top division. Hopp spent large amounts of money on new players and coach Ralf Rangnick and Hoffenheim managed two consecutive promotions and eventually entered the Bundesliga in 2008, which it has played in since then.