Luis Suarez accepted Barcelona's 2-0 La Liga loss at Granada was a worrying result.
Goals from Ramon Azeez and Alvaro Vadillo moved promoted Granada top of the table and deepened Barca's growing crisis.
They are without a win in seven away games in all competitions, while their start to the new LaLiga campaign is their worst in 25 years.
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Regardless of their poor form, Barca are only three points off the top of the table and Suarez called for Ernesto Valverde's side to buck up their ideas quickly.
"It is a defeat that worries and hurts, and we have to look at many things," he said after the game.