A Real Madrid badge was spotted on the scoreboard in front of Josep Maria Bartomeu's presidential box seat at the Camp Nou.
Pictures showing the logo emerged after the Blaugrana's 5-0 triumph over Eibar on Saturday.
It is not clear, though, why or how this badge got there.
Bartomeu was whistled at before the kick off, with fans calling for his resignation from the stands.
Last week, the Barcelona president was linked to a PR company that was allegedly hired to discredit certain people through social media.