The teenage was part of the Germany side eliminated from the European U19 Championship in Greece during the group stage, but his earlier than expected return has enabled him to complete a summer switch which is reported to be worth ???10million.
Tah, 19, spent last season on loan at second division side Fortuna Dusseldorf and he has signed a five-year contract with Leverkusen.
“Jonathan Tah is a greatly talented central defender who was able to get some valuable match practice at Fortuna Dusseldorf last season and proved to be one of the pillars of that side,”??Leverkusen director of sport Rudi Voller said on his club’s website.
“His signing is a great investment in the future, but Jonathan has the class to help us out immediately.
“There were many clubs interested in him and this makes us even happier that he has chosen Bayer Leverkusen.”
Tah failed to help Germany defend their U19 title this summer, but he is already looking to the future after that disappointment.
“I’m pleased to be here now,” he said. “Bayer are a great club and I believe I can take the next step here.
“I already know some of my new team-mates and I’m sure I’ll settle in quickly.”