
"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."

Márton Szép from the Bayer 04 Leverkusen U19 team is moving back to his home country with immediate effect to join ETO FC, the current leaders of the top flight in Hungary.
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The Werkself host Bayern Munich at the BayArena on matchday 26 in the 2025/26 Bundesliga season. The match is on Saturday, 14 March, with the kick-off at 15:30 CET. Information on ticket sales.
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Werkself TV shows the highlights of Bayer 04's 1-1 draw at Borussia Mönchengladbach on Matchday 21 of the 2025/26 Bundesliga season...
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Bayer 04’s four-game winning run in all competitions came to an end with a 1-1 draw away at Borussia Mönchengladbach on Bundesliga Matchday 21. Yannik Engelhardt scored early for the hosts, but an own goal from Philipp Sander brought the Werkself back level before the break.
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