The Catalan club recognized defeats in the home walls.
Barcelona took on Leganes in the 17th round of the Spanish Championship.
The guests sensationally beat the hospodars to Sergio Gonzalez's goal in the fourth half of the game.
Barcelona - Leganes 0:1 Goal: Gonzalez, 4 Barcelona: Pena - Kunde, Garcia (Kubarsi, 74), Martin, Balde - Casado (Viktor, 80), Pedri - Yamal (Gavi, 75), Olmo, Dias - Lewandowski (.