
"Mario Hermoso is an experienced player on the international stage and, in addition to playing as a central defender, he is a very capable and organised left back," said Bayer 04 sporting managing director Simon Rolfes in describing the 1.84 metre tall defender. "Mario will also bring additional versatility to our defence and will compensate very well for the absence of Jeanuel Belocian."
Hermoso knows Bayer 04 well having played the Werkself twice in Champions League games in 2022/23. "They were two highly emotional games with neither side giving anything away exactly like it was in Madrid a week or so ago," said Hermoso, who has made five international appearances for Spain. "I'm very much looking forward to aiming to achieve big targets with the Werkself. Everything is set up here for a successful season on the pitch."

The Werkself welcome FC Augsburg to the BayArena on Bundesliga matchday 30 in the 2025/26 season. The match on Saturday, 18 April kicks off at 15:30 CEST. Bayer 04 have organised a family matchday with exclusive offers for parents and children. Information on ticket sales.
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The Werkself host VfL Wolfsburg at the BayArena on matchday 28 in the 2025/26 Bundesliga season. The match is on Saturday, 4 April, with the kick-off at 15:30 CET. Information on ticket sales.
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The #B04 eSports team made a successful start to the 2025/26 VBL Club Championship finals. Marc and Sean Landwehr defeated the hosts of the event, Hamburger SV, in the Round of 16. The quarter-final in the German club championship will be played on Sunday, 8 March at 14:00 CET against SC Freiburg, who finished top of the table in the league phase.
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Werkself TV shows the highlights of Bayer 04's 3-3 draw at SC Freiburg on Matchday 25 of the 2025/26 Bundesliga season...
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