
"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 3-1 win at RB Leipzig on the 25th matchday of the Google Pixel Frauen-Bundesliga 2025/26.
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The Werkself need a win in their penultimate match of the season at RB Leipzig on Monday evening (18:00 CEST) to keep their hopes of third place alive until the final day. After Eintracht Frankfurt lost on Saturday, Roberto Pätzold's side can close the gap on their rivals to two points and leave it all to play for next Sunday.
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Werkself TV shows the highlights of Bayer 04's 1-3 loss at VfB Stuttgart on Matchday 33 of the 2025/26 Bundesliga season...
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Down to fifth from fourth place despite taking an early lead: in the head-to-head for a Champions League spot, Bayer 04 were 1-0 up at VfB Stuttgart with just a minute played thanks to an Aleix Garcia strike, but ultimately lost 3-1 (2-1) to the more determined hosts. It meant the Swabians leapfrogged the Werkself in the Bundesliga table on the penultimate matchday.
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