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Saúl Ñíguez was a product of Atlético Madrid's youth academy. He joined the club at the age of 14 and progressed through the ranks, making his debut for the first team in 2012. He has since become a key player for the club, helping them win the La Liga title in 2014 and 2016. He has also represented Spain at various youth levels, and made his senior debut in 2016.