The German club has agreed to sell Stach to Leeds, allowing the midfielder to join the Premier League team.
Stach has reportedly agreed to a four-year contract with Leeds, and is expected to make an instant impact in the Premier League.
Leeds has been busy in the transfer market, also bringing in defenders Sebastiaan Bornauw, Jaka Bijol, and Gabriel Gudmundsson, as well as midfielders Sean Longstaff and Lukas Nmecha.