In 2002, a number of Europe's leading clubs were on Frings's trail prior to the World Cup but he opted for a four-year deal with Borussia Dortmund for a reported fee of €10 million, penning the contract two games into the competition. A regular in his first term at the Westfalenstadion, Frings also played 12 times in the UEFA Champions League, scoring home and away against Lokomotiv Moscow.