Borussia Dortmund have announced they will sign Omer Toprak from Bayer Leverkusen on a contract until 2021 at the end of the season.
Toprak, 27, has a release clause in his contract that Dortmund have met allowing him to move.
"Omer Toprak is a strong defender with international experience and great leadership qualities," sporting director Michael Zorc said in a statement on Dortmund's official website.
- Borussia Dortmund (@BVB) February 5, 2017
The statement added: "Out of respect for their Bundesliga rival, BVB will make no further comment on Omer Toprak until the end of the current season."
Toprak, a central defender who began his career with Freiburg before moving to Leverkusen in 2011, has made 181 Bundesliga appearances and another 23 in the Champions League.