Koscielny is a combative centre-half for Arsenal, and a current France international. The Frenchman began his career at Guingamp as mainly a right full-back, debuting in 2004 at the age of 19. He established himself as a capable defender in the lower leagues of France's league system, but after three years with Guingamp, Koscielny moved to Tours FC in the second division and began his rise to prominence.
Moving to his preferred centre-half, Koscielny impressed in his two seasons with Tours - particularly the 2008-2009 season where he scored 6 times from defence. But Tours failed to reach promotion, and they couldn't hold onto Laurent - as top-flight team Lorient swooped for him in 2009. Koscielny continued to help his teams forward, with Lorient achieving 7th in Ligue 1 in 2010 - its best finish ever. French football was unable to hold onto Koscielny any longer, with compatriot Arsene Wenger spending a reported £8 million to bring the defender to Arsenal in London.
Given the number 6 - the same number as legendary former captain Tony Adams - Koscielny adapted well to English football in his first season. He became an ever presence in Arsenal's defence, playing 43 times and scoring 3 times in his maiden campaign; with the only real blemish coming in the League Cup final at Wembley, where a mix-up with his keeper allowed Birmingham to score the winner. Koscielny's performances have also led to his call-up to the French national side.
He debuted in a friendly game against the United States in November, and despite his one cap should be part of the France squad for Euro 2012.