Barcelona coach Quique Setien was unhappy with their finishing after Sunday's 2-1 defeat of Levante.
The visitors had several chances to score in the second half and were only able to take one of them at the Camp Nou.
"I'm very happy with lots of things, but not with everything," Setien said after the game.
"We conceded too many shots. We had a very good first half; I think we could've scored more goals.
"We lost a bit of control in the second half and we conceded too many [shots], but it was a good job by the team.
"Conceding too many [shots] worries me because you risk conceding goals.
"We've had so many chances and we have to take advantage of them. That's important.
"It could've finished 8-2 or 8-3."
Ansu Fati scored both of Barcelona's goals on the night to become the youngster player to score a LaLiga Santander double.
"He's a boy that is emerging and he has great potential. He does things very well," Setien said of the 17-year-old.
"Today, he had a historic day because of his goals and because of the help of the team.
"His defensive work was very important."