Answer
FC Luzern is the Swiss club that Ruben Vargas played for before joining FC Augsburg. Vargas, a Swiss winger, began his professional career with Luzern in 2017. He made 70 appearances for the club, scoring 15 goals and providing 10 assists. His impressive performances earned him a move to Augsburg in 2019, where he has continued to showcase his attacking prowess.