Jan Leszczyński has signed a long‑term contract with Borussia Mönchengladbach from Legia Warsaw. The 19‑year‑old centre‑back will join after his medical, with the German club paying around €3 million. It is Gladbach’s seventh signing of the summer.
Jan Leszczyński is a 19-year-old Polish centre-back who started his professional career at Legia Warszawa. Leszczyński transferred to Borussia Mönchengladbach in the summer of 2026 and has represented Poland at the U-17 and U-19 youth levels.