
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.


The German Football League (DFL) has announced the three candidates for the title of Bundesliga Rookie of the Month for January. That includes Werkself player Jarell Quansah. Fans of Bayer 04 can vote for their favourite on the Bundesliga app from now until Thursday, 5 January (23:59 CET).
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The Leverkusen eSports team picked up valuable points and made up ground in the overall table with a top four finish in the offline round in Showdown 4 in the VBL Club Championship 2025/26. In the round of 16, Showdown 1 winners Bayer 04 defeated the unbeaten runners-up in the previous round, VfL Bochum, in a thrilling penalty shoot-out. The Landwehr cousins, themselves the current club runners-up, then beat the current club champions and Showdown 3 winners RB Leipzig. It was not until the semi-finals that they lost out to the eventual showdown winners Borussia Mönchengladbach.
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Bayer 04 have agreed a loan move for U19s striker Ken Izekor to join Bundesliga 2 club Eintracht Braunschweig on loan for the rest of the 2025/26 season.
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Bayer 04 have agreed a loan deal for Jeanuel Belocian to join fellow Bundesliga club Wolfsburg on loan until the end of the season. The 20-year-old defender’s contract in Leverkusen runs until 30 June 2029.
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Bayer 04 have recalled Tim Oermann from his loan at Sturm Graz and will now include the centre-back in the team’s plans for the rest of the 2025/26 season. The Germany U21 international signed for the Werkself from Bochum in summer 2025 on a contract until 30 June 2029.
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