Castore has become the kit partner of Bundesliga club Bayer 04 Leverkusen.
The Manchester-headquartered brand has signed a deal until June 30, 2027.
The company, which was founded in Liverpool, already has similar deals with the likes of Newcastle United, Ranges, England Cricket and Saracens.
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Tom Beahon, co-founder of Castore, said: "It‘s a significant step for us to start working in the German market with an internationally oriented club with such a history.
"When we set up Castore the vision of my brother and I was to see world-class athletes wear our products and now we have taken another important step in that direction.
"It’s an honour that Bayer 04 have chosen Castore. Our values and ambition of wanting to be the best go perfectly together."
Fernando Carro, CEO at the Werkself, added: "We have found an innovative partner in Castore whose ambitions very much fit in with Bayer 04.
"Both the quality of the products as well as the digital and international approach of the company has impressed us.
"Together with Castore, we want to set new standards in the future primarily in the areas of sponsorship and target group activation."
Castore also has partnerships with Wolverhampton Wanderers and McLaren Racing.
