Borussia Dortmund to sign Omer Toprak from Bayer Leverkusen

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.

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.