Ernesto Valverde branded Barcelona as "terrible" for their 2-2 draw at Osasuna.
Roberto Torres put the hosts in front inside the first 10 minutes and, after the Blaugrana struggled to get back into the game, Valverde was forced into making changes at half time.
They scored twice, but then allowed Osasuna a late chance to equalise when they conceded a penalty.
"We weren't good at all, we were terrible," the Barcelona boss said.
"They went in front and we couldn't get into their box.
"We had some chances, but they got stronger and we weren't able to threaten them in front of goal.
"We dominated the play more in the second half and we came back. We had the game absolutely done, but they came forward and then came the absurd moment that brought the penalty.
"We can't allow the game to escape us, we have to assert ourselves better on the field and keep attacking."
Asked for his thoughts on the Gerard Pique penalty incident, Valverde admitted he hadn't seen a replay yet.
"I haven't seen the incident," he said about the handball.
"In the end, the player can't do anything."
