On 30 August 2017, Passlack extended his contract with Borussia Dortmund and was loaned out to Hoffenheim for two years. The loan spell at Hoffenheim was terminated early in July 2018.[5]
In 2014, Passlack made six appearances for Germany at under-16 level and in the same year he debuted for the Germany U17 team. In May 2015, Passlack was selected to captain the Germany squad at the 2015 UEFA European Under-17 Championship in Bulgaria, he played every single minute of the tournament, scoring three goals and helping Germany reach the final where they lost 4–1 to France.[10] In October 2015, Passlack captained Germany at the 2015 FIFA U-17 World Cup in Chile, appearing in all four of Germany's matches and scoring two goals as Germany were eliminated in the round of 16 in a 2–0 loss to Croatia. In total, Passlack has scored seven goals in 20 appearances for the Germany U17 team. In March 2016, Passlack was called up to the Germany U18 team for the first time and later that year, received his first call to the Germany U19 team.
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