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Karim Matmour spent his youth career with SC Freiburg, a German professional football club. He joined the club's academy at the age of 10 and spent seven years there before signing his first professional contract in 2008. He made his debut for the club's first team in 2009 and went on to make over 100 appearances for the club. He also helped the club win the 2. Bundesliga in 2010.