
The background to the ban is a dispute between Hakan Calhanoglu and the Turkish club Trabzonspor. During his time at Karlsruhe SC in 2011 Calhanoglu, as a minor, reached agreement with Trabzonspor regarding a transfer. However, he extended his contract at Karlsruhe SC and later joined Hamburg SV. The CAS agreed with FIFA that the actions of the player represented a breach of contract with Trabzonspor.
Bayer 04 Leverkusen were not involved in the proceedings as the player signed for the Bayer 04 Leverkusen several years after the incident. "Of course, we regret this decision which is completely incomprehensible for us," said sporting director Rudi Völler. "It's a heavy blow for Hakan but also for us. We’re also being heavily punished although Bayer 04 Leverkusen had nothing to do with the events in 2011. We are now missing a very important player in a crucial phase of the season."
Bayer 04 CEO Michael Schade also criticised the verdict. "In addition to the player, it also affects the club that played absolutely no part in the events of the time. Unfortunately we are left with no alternative but to accept the decision," said Schade.

Two Saturdays, one Friday and one Sunday: The dates for the Bayer 04 Women's team games on matchdays 16 to 19 have been finalised. Three of the four matches scheduled by the German Football Association (DFB) on Tuesday will be played at home at the Ulrich Haberland Stadium.
Show more
The Werkself rang in the Black and Red festive season with an emotional visit to Klinikum Leverkusen. Kristin Kögel, Melissa Friedrich and Louisa Remien from the Bayer 04 Women's team and Jonas Hofmann, Janis Blaswich and Niklas Lomb from the first team visited the young patients on the children's ward and, for the first time, on the ‘Zeitinsel’ children's palliative care unit. They brought a host of lovingly wrapped presents ensuring a big surprise for young and old alike.
Show more
Four Bayer 04 players are in action at the 35th edition of the Africa Cup of Nations being played in Morocco from 21 December to 18 January 2026: Eliesse Ben Seghir for the hosts, Edmond Tapsoba with Burkina Faso, Ibrahim Maza for Algeria and Christian Kofane with Cameroon. Updates on the AFCON matches involving Werkself players...
Show more
Bayer 04 Women finish 2025 with the first game of the second half of the Google Pixel Bundesliga season as they host defending champions and league leaders Bayern Munich at the Ulrich-Haberland-Stadion on Monday. Kick-off is at 18:00 CET. Here’s all you need to know ahead of the Matchday 14 encounter.
Show more