Mateusz Kochalski is a Polish goalkeeper born in Swidnik in 2000. He developed at Legia Warsaw and gained senior experience through loans to Legionovia Legionowo and Radomiak Radom, helping Radomiak in their rise through the Polish leagues. After leaving Legia, he joined Stal Mielec in 2022 and became a first-choice goalkeeper in the 2023-24 season, when he was named Ekstraklasa Goalkeeper of the Season. Qarabag signed him in 2024. Kochalski also represented Poland at youth levels and received a senior call-up in 2024.