Kacper Potulski, Borussia Dortmund, Mainz
28 May 2026
Borussia Dortmund have reportedly failed with a €20 million approach for Mainz defender Kacper Potulski. The 18-year-old impressed during his breakout season and is attracting interest from Germany, England and Italy before the summer window.
Mainz are said to value Potulski closer to €30 million, making Dortmund’s first move insufficient. Dortmund have already signed Joane Gadou, so their next step may depend on budget, defensive plans and rival interest developing quickly.