Crystal Palace took the lead in the 36th minute when Maxence Lacroix headed home a cross from Adam Wharton. The second goal came in the 90+3 minute as Evann Guessand struck a right‑footed shot from the right side of the box to seal a 2‑0 win.
Both sides had chances, but Crystal Palace missed opportunities from Ismaïla Sarr, Chris Richards and Daichi Kamada, while Zrinjski Mostar failed to convert shots from Leo Mikic and Tomi Juric.
