On 9 January 2001, Rosický joined Borussia Dortmund, signing a five-year contract. His transfer fee of DM 25 million (approximately £8 million), made him the most expensive player in Bundesliga history and the most expensive Czech player to be sold to a foreign team. In his first full season at Dortmund, Rosický helped the club to win the 2001–02 Bundesliga title. He also took part in the 2002 UEFA Cup Final, which Dortmund ultimately lost 3–2 to Feyenoord. During his first two-and-a-half seasons with the club, Rosický played 75 league matches, scoring nine goals and registering 20 assists. He subsequently agreed to extend his contract with Dortmund in July 2003, signing a deal to stay at the club until 2008. At the end of the season, Rosický was announced as the winner of the Czech Republic's Golden Ball award.