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Mathieu Debuchy is a French professional footballer who plays as a right back for Saint-Étienne. He has also represented France at international level, earning 34 caps and scoring two goals. Debuchy started his career at Le Havre before joining Lille in 2007. He spent four seasons with Lille, helping them to win the Ligue 1 title in 2011. In 2011, Debuchy joined Newcastle United for a fee of £5.5 million.