Athletic Club’s final UEFA Champions League league-stage match ended in a 2–3 defeat to Sporting CP on Wednesday, 28 January 2026. Referee Felix Zwayer of Germany took charge of the fixture at a neutral venue, with kickoff at 20:00 UTC. The home side led 2–1 at the break but could not hold on in the second half, as Sporting CP overturned the deficit to claim all three points on Matchday 8 of the competition.

For Athletic Club, the loss meant they finished the league phase with a negative record...