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Şahin represented Turkey in international football. He made his debut for the Turkish national team in 2005 and went on to earn over 50 caps, scoring 15 goals. He played in two UEFA European Championships (2008 and 2020) and the 2002 FIFA World Cup, where Turkey finished third. Şahin was known for his technical ability, dribbling skills, and versatility, playing in various positions, including attacking midfield, winger, and second striker.