Barcelona have picked up just 11 points from their first eight La Liga games this season - their worst tally since 1991-92.
Ronald Koeman's side suffered a disappointing 1-0 defeat against Atletico Madrid on Saturday with Yannick Carrasco scoring the winner in first-half injury time.
The result was the first time Diego Simeone has defeated Barcelona in La Liga with Atletico ending a 20-game winless run against the Catalans in the Spanish top-flight.
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Simeone's men have now also gone 24 games without defeat in La Liga and currently sit second in the competition on goal difference but with a game in hand.