Barcelona coach Ronald Koeman was left feeling concerned by the manner of Atletico Madrid's winning goal in Saturday's 1-0 defeat at Wanda Metropolitano.
Barca travelled to Madrid having won only one of their previous five La Liga matches, a run of results that already had them playing catch-up in the table.
Defeat – their third in a little over a month – means they could end the weekend in the bottom half of the table, with the Blaugrana seemingly struggling to recover from a tumultuous pre-season off the pitch.
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The solitary goal conceded against Atletico came at the end of the first half when Gerard Pique – who was later substituted with a nasty-looking knee injury – failed to cut out Angel Correa's pass, and Yannick Carrasco skipped past the stranded Marc-Andre ter Stegen before slotting into an empty net from 35 yards.