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FC Luzern was the youth club that Ruben Vargas joined in 2015. He began his football career with FC Adligenswil, before moving to FC Luzern's youth academy at the age of 15. Vargas progressed through the ranks at Luzern, making his first-team debut in 2017. He quickly established himself as a key player for the club, and in 2019, he earned a move to FC Augsburg in the Bundesliga.