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The French professional footballer Laurent Koscielny began his professional career in 2003 at the age of 18, joining the Ligue 2 club EA Guingamp. He spent five seasons at Guingamp, making over 150 appearances and helping the club achieve promotion to Ligue 1 in 2006. During his time at Guingamp, Koscielny established himself as a promising young defender and attracted the attention of several top clubs.