Youssef En-Nesyri scored Leganes' only goal as they fell to a 2-1 loss against Eibar in La Liga.
En-Nesyri, who was making his 11th league appearance on Sunday, opened the scoring at the Estadio Municipal de Butarque as early as in the sixth minute.
The effort was the 22-year-old's first strike of the season but it could not help Leganes grab their second league win.
Nigeria's Kenneth Omeruo was not called up for the game while his compatriot Chidozie Awaziem watched on from the bench.
After conceding their ninth defeat this term, Leganes remain rooted to the bottom of La Liga table with just five points after 11 games.