Mainz 05 has signed Kacper Potulski to a new long-term contract. The exact duration of the contract has not been disclosed. The Technical Director, Meikel Schönweitz, emphasized Potulski's development over the last two years and his potential as a central defender. Potulski has been promoted to the highest training squad and participated in training sessions and test matches with the professionals. The club aims to gradually introduce him to this level.