Athletic Club suffered a 1–2 defeat at home to Espanyol on Monday, 22 December 2025, in a La Liga Matchday 17 fixture that kicked off at 20:00 UTC. The match, refereed by Mateo Busquets Ferrer of Spain, was level at 1–1 at the half-time interval before Espanyol secured the victory in the second half at San Mamés.

For Athletic Club, the defeat at home was a significant setback in their campaign. At that stage of the season, the Basque side were pushing for a European qualification spot in La Lig...