"With us, he has become one of the best central defenders in the Bundesliga and we are happy Omer has opted to stay with us for the long term," said Leverkusen CEO Michael Schade.

Along with Stefan Kiessling, Lars Bender and Bernd Leno, Toprak is the fourth key player recently to extend his contract with Bayer, who face Paris St Germain in the last 16 of the Champions League.

The 24-year-old Toprak joined Leverkusen from Freiburg in 2011 and has made 19 appearances for Turkey.