Ernesto Valverde admitted Barcelona are in a rut after they followed up their La Liga defeat by Levante with a goalless draw at home to Slavia Prague on Tuesday in the Champions League.
Lionel Messi hit the crossbar in the first half but that was as close as Barca came during a disjointed display that risks dragging Valverde's team back into the fight for qualification from Group F.
"The other day we lost against Levante and we know this was not one of our best games either," Valverde said.
"We haven't been convincing either on Saturday or today and we know there is a lot of pressure now on the team. We have to respond."
"It is never enough. The season begins and there isn't talk of winning a title, there is talk of winning three or four. So the frustration when you don't win a game is high."
- Pique pleads for 'patience' -
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"We are not playing at the level we expect. We have to improve."
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