
"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."

Werkself-TV shows the highlights of the Bayer 04 women's 0-1 loss against TSG Hoffenheim on the 19th matchday of the Google Pixel Frauen-Bundesliga 2025/26.
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A proud anniversary: 2026 marks the 50th anniversary of the founding of the first Bayer 04 official fan club. The pioneers of the "First fan club 1976 Leverkusen" still hold their love for the club dear, black and red passion knows no expiry date. Read on to discover the development of organised fan culture at Bayer 04 and where it is practised around the country and the world.
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After a run of seven games unbeaten in all competitions, the Werkself suffered a 1-0 defeat at FC Union Berlin despite their best efforts. Captain Robert Andrich, who took responsibility for the goal, said after the match: "Now we have to focus on not losing our heads even in difficult situations. That has always made us strong in the past." The Werkself review.
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Werkself TV shows the highlights of Bayer 04's 0-1 loss at Union Berlin on Matchday 23 of the 2025/26 Bundesliga season...