Lukas Manuel Klostermann is a German professional footballer who plays as a right-back for RB Leipzig and the Germany national team.
Subsequently, he did not play another game for Bochum and on 22 August 2014 it was announced that he would transfer to RB Leipzig. He signed for Leipzig on a four-year deal until 2018.
Shortly after joining RB Leipzig, Klostermann was assigned to the U19 and RB Leipzig II. He made his RB Leipzig debut against Erzgebirge Aue in the second round of DFB-Pokal on 29 October 2014 but scored an own–goal and helped the side win 3–1 later in the game. It wasn’t until on 12 December 2014 when he made his league debut for the club, where he came on as a late substitute, in a 1–0 win over Greuther Fürth. He then made his first start for RB Leipzig on 6 February 2015, in a 2–2 draw against Erzgebirge Aue. Towards the end of the 2014–15 season, Klostermann was given a handful of first team appearances following the club’s defensive crisis. He then scored his first goal for the club on 24 April 2015, in a 2–1 win over Darmstadt 98. At the end of the 2014–15 season, Klostermann went on to make a total of 15 appearances and scoring once in all competitions.
In the 2015–16 season, Klostermann started the season, playing in the right–back position for the side and soon became the club’s first choice throughout the season. He set up a goal for Davie Selke, in a 2–2 draw against Greuther Fürth on Matchday 2. He then scored his first goal of the season, in a 2–1 win over 1860 Munich on 13 March 2016. Klostermann later helped the club get promoted to the Bundesliga for the first time after beating Karlsruher SC 2–0 on 8 May 2016. Despite missing out three matches, due to injuries later in the 2015–16 season, Klostermann went on to make a total of 31 appearances and scoring once in all competitions.
Ahead of the 2016–17 season, Klosterman was linked with a move away from RB Leipzig, as Premier League duo Tottenham Hotspur and Arsenal showed interest. However, his season was overshadowed with injuries. He only made one (and only) appearance this season, starting the whole game, in a 1–0 win over Borussia Dortmund on Matchday 2. While rehabilitating his injuries, Klostermann signed a contract extension with the club, keeping him until 2021. It wasn’t until May 2017 when he returned to training with the first team on a full recovery.
The 2017–18 season saw Klostermann regaining his first team place at RB Leipzig, playing in the right–back position. Despite his absence at the start of the season, he scored his first goal for the club, in a 2–1 win over 1. FC Köln on 1 October 2017. In the second half of the 2017–18 season, Klostermann lost his place in the right–back position to Konrad Laimer. Instead, he began to play in the left–back position for the rest of the 2017–18 season, although he occasionally played in the right–back position. At the end of the 2017–18 season, Klostermann went on to make thirty–nine appearances in all competitions.
Ahead of the 2018–19 season, Klostermann was linked with a move to Serie A side A.S. Roma but dismissed the move and wanted to stay at the 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 appearances 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.