[4] In the 2000 summer he signed for SC Freiburg in the Bundesliga, making his debut in the competition on 12 August by playing the full 90 minutes in a 4–0 home win against VfB Stuttgart, and scoring his first goal on 12 December of that year to help to a 2–1 away success over VfL Wolfsburg.

He was no longer part of the squad, however, as he had left in the 2002 January transfer window to Borussia Dortmund, who went on to win the championship with 15 games and one goal from the player.

On the first day of the 2006–07 campaign, Kehl injured his left knee in a challenge with Bayern's Hasan Salihamidžić, sidelining him for several months and only recovering fully at the start of 2008–09, when he was made captain by new coach Jürgen Klopp.

[6] He eventually relapsed on his condition,[7][8] also losing his importance in the starting XI after the emergence of Sven Bender and Nuri Şahin.

[16] Kehl earned the first of his 31 caps for the Germany national team on 29 May 2001, in a 2–0 friendly win against Slovakia in Bremen where he came on for Marko Rehmer after 45 minutes.