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Tomáš Vaclík began his professional football career with Viktoria Plzeň, a Czech football club based in the city of Plzeň. Vaclík joined the club's youth academy at a young age and progressed through the ranks, eventually making his first-team debut in 2008. He spent several seasons with Viktoria Plzeň, establishing himself as a reliable and talented goalkeeper, before moving on to other clubs in his career.