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Tomáš Kalas is a Czech professional footballer. Born in Olomouc, Czechoslovakia (now the Czech Republic), Kalas began his career with Sigma Olomouc before moving to Chelsea in 2010. He has since played for several clubs on loan, including Vitesse Arnhem, Burton Albion, Middlesbrough, and Fulham. Kalas has also represented the Czech Republic at various youth levels and made his senior international debut in 2012.