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Kehl began his professional career at SC Freiburg, where he quickly established himself as a regular member of the starting lineup. Known for his versatility, he primarily played as a defensive midfielder but was also capable of operating as a full-back or a center-back. Kehl's performances at Freiburg earned him recognition as one of the rising stars of German football, eventually leading to his move to Borussia Dortmund in 2002.