Ernesto Valverde said he was worried about Barcelona's form to start the season following a 2-0 loss to Granada.
With 7 points from 5 matches, it is the club's worst start to a season since 1994.
"I'm worried because away from home we aren't getting good results. When four away games have gone by, it's a symptom that something isn't too good. There are players who arrived late, but we haven't been good, we're not playing well away," said Valverde.
Barcelona are tied with Real Betis for conceding the most goals in La Liga.
Barcelona play Villarreal on Wednesday.