Just days after coach Julian Nagelsmann and sporting director Alexander Rosen penned new deals, Amiri has tied himself to last season's fourth-placed finishers until 2020.
"I would of course like to repay the faith shown in me. That's my goal. TSG has become a bit like a home for me," Amiri, who joined the club's youth academy as a 15-year-old in 2012. "I know exactly what I have at TSG and I'm sure I can continue to develop, particularly with the upcoming international challenges."
After Oliver Baumann, Steven Zuber and Kerem Demirbay, Amiri, who has scored six goals in 65 career Bundesliga appearances, is the latest member of Nagelsmann's squad to put pen to paper on a new deal as the club prepares for its maiden UEFA Champions League tilt.
Nagelsmann, who had Amiri in his U19 team as Hoffenheim won the German title in that age category in 2014, was delighted the club have ensured the attacking midfielder's middle-term future is at the Rhein-Neckar-Arena.
"He's a special player, because he can go from our youth academy to become a high-performing young professional," the Bundesliga's youngest coach stated. "His development is far from complete, and it's great to be able to actively support Nadiem along his career path."
Watch: Amiri's first Bundesliga goal in a thriller with Gladbach