German midfielder Lukas Rupp became Norwich's first permanent signing of the 2020s when he joined on 13th January 2020 from 1899 Hoffenheim for an undisclosed fee. He signed a contract until the summer of 2022.

After starting his career with Karlsruher in 2008, for whom he made 26 first team appearances, Rupp then went on to play top-flight football in Germany with Borussia Monchengladbach, Paderborn, Stuttgart and Hoffenheim. He moved to Monchengladbach in 2011 and made 34 appearances. Struggling to become a first team regular, he was loaned to Paderborn in 2012. He then joined Paderborn on a free transfer in the summer of 2014.

After Paderborn's relegation at the end of the 2014/15 season, Rupp signed for Stuttgart. He made 29 appearances, scoring 5 goals but his performances were the 'bright light in a season to forget' as Stuttgart were relegated. After speculation linking him with Middlesbrough, he joined 1899 Hoffenheim for 6 million Euro, reportedly, in June 2016. He had made 43 appearances at the time of his transfer to Norwich. He has also played for Germany's Under-20s and in the Champions League and Europa League.

Norwich manager Daniel Farke added: "Lukas is a great guy who has a lot of experience. He's played for some very big clubs in Germany and has a lot of game time in the Bundesliga. He's a versatile player who can play in a number of positions in the midfield and has also played at full-back."

Rupp made his debut for Norwich as a 90th minute substitute in the 1-0 home win over Bournemouth on 18th January 2020 and his first start came on 24th January in the 2-1 defeat away at Spurs. He finished the season with 15 appearances as Norwich were relegated to the Championship.

The following season saw Rupp make 25 appearances in between injuries as Norwich won the Championship title.

Rupp scored his first goal for Norwich in the 6-0 thrashing of Bournemouth in the Carabao Cup in August 2021. He made 22 appearances in 2021/22 as City finished bottom of the Premier League.

On 20th May 2022 it was reported that Norwich would not be renewing his contract.

On 28th January 2023, it was reported that Rupp was going to sign for Alan Pardew's Aris Salonika according to German magazine Kicker who said Pardew has turned to Rupp after playmaker Manu Garcia suffered a cruciate ligament injury. This was confirmed a few days later.

On 16th September 2024 he returned to Germany to sign for Hessen Kassel in the fourth tier of German football (the Regionalliga Sudwest)