club. However, at the start of the 2018–19 season, he was sidelined, due to being on the substitute bench and suffered a knee injury. After returning from a knee injury, Klostermann regained his first team place in the right–back position despite facing strong competitions in the same position. It wasn't until on 11 November 2018 when he scored his first goal of the season and set up one of the goals, in a 3–0 win over Bayer Leverkusen. During the match, Klostermann made his 100th appearance for the side. His second goal of the season came a month later on 22 December 2018, in a 3–2 win over Werder Bremen. After suffering a hamstring injury while on international duty, Klostermann returned from injury, starting the whole game, in a 4–2 win over Bayer Leverkusen on 6 April 2019. Then on 3 May 2019, he scored twice for the side, adding his tally to five goals this season, in a 3–3 draw against 1. FSV Mainz 05. Klostermann helped the club reach their first DFB-Pokal Final after beating Hamburger SV 3–1. In the final against Bayern Munich, he started the whole game, as RB Leipzig lost 3–0. At the end of the 2018–19 season, Klostermann went on to make forty appearances and scoring five times in all competitions. International career Youth career Having previously represented the Germany youth team, Klostermann was called up by Germany U17 in February 2013. He made his Germany U17 debut, where he played 40 minutes after coming on as a substitute, in a 3–1 win over Netherlands U17 on 10 February 2013. He went on to make 6 appearances for the Germany U17 side. A year later in September 2014, he was called up to the Germany U19 team. He made his Germany U19 debut, starting the whole game, in a 3–2 win over Netherlands U19 on 5 September 2014. However, during a 1–1 draw against England U19 on 8 September 2014, Klostermann suffered a concussion and had to be substituted. He then captained Germany U19 for the first time on 28 March 2015, in a 3–2 win over Republic of Ireland U19. Klostermann was later called up for the Germany U19 squad again for the UEFA European Under-19 Championship in June 2015. He went on to make three appearances in the tournament, as Germany U19 were eliminated in the Group Stage. After the tournament, he