The Catalans slumped to a second straight La Liga defeat after rattling the crossbar on four occasions and coming up against an inspired performance from Celta goalkeeper Sergio Alvarez.
"We had 19 shots, nine on target and hit the woodwork four times – sometimes the ball does not want go in," he told reporters.
"I am not worried and I liked the players' attitude but I am pissed off at not being able to win the game.
"Usually games like this one are games to win, but this was not our day. If you are not clinical and then have Sergio's intervention, you can get results like this."