Ronald Koeman criticised his Barcelona players for missing two penalties after they needed extra time to break down stubborn third-division side Cornella and reach the Copa del Rey last 16.
Goals from Ousmane Dembele and Martin Braithwaite sealed a 2-0 victory for Barca but only after Miralem Pjanic and Dembele had both failed to score from the spot in normal time.
Pjanic and Dembele join a list of five Barcelona players to have missed penalties this season, along with Lionel Messi, Antoine Griezmann and Braithwaite.
"I don't understand because normally there are enough players who can score penalties," said Barca manager Koeman. "Maybe they are scary, I don't know. Several players have failed and, above all, if you score one of the two penalties, you calm down.
"You cannot miss two penalties as Barca players. It's not serious."
Barca were looking for a reaction on the back of their shock loss to Athletic Bilbao in the Spanish Super Cup final on Sunday, when Messi was sent off for the club for the first time.
With Messi suspended, a rotated line-up laboured to victory after a third consecutive extra-time in eight days.
Pjanic missed the first penalty in the 39th minute after Ronald Araujo went down under a high boot from Albert Estelles, with Cornella goalkeeper Ramon Juan diving low to his right.
Griezmann and Braithwaite both failed to finish early in the second half and then Griezmann blazed over on the volley after a clever free-kick from Pjanic.
Another penalty presented a golden opportunity in the 80th minute after another Estelles error, this time a handball. Dembele stepped up but the result was the same, his driven effort down the middle again kept out by Juan.
The 21-year-old became the first goalkeeper to save two Barca penalties in one game.
Cornella, who beat Atletico Madrid in the previous round, saw their resistance last only two minutes into extra time as the power of Dembele's shot from distance was too much for the keeper, who could only divert the ball in off the crossbar.
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Gallery: Bilbao beat Barca in Super Cup
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Estelles completed his nightmare night by being sent-off before Braithwaite added a second on the counter-attack.
Despite the defeat, Juan could at least console himself with the praise of Barca's No 1, Marc-Andre ter Stegen.
He produced other superb saves to deny Francisco Trincao, Braithwaite and Konrad de la Fuente but was finally beaten at either end of extra time.
Barca's Neto was playing on the night but first-choice keeper and Germany international Ter Stegen, who was sitting on the bench, showed his appreciation for the youngster's superb display by embracing him after the final whistle.
"He told me I was very good and I'm absolutely delighted," Ramon Juan told reporters.
The keeper said he had never saved two penalties before in his life, not even in a shootout, but had carefully prepared for the game with the club's goalkeeping coach.
"We spoke about who would take their penalties and how they would take them and then it came down to intuition," he added.
"I had seen two penalties Pjanic took for Juventus and I thought he would shoot to my right. Dembele's was about instinct."
