Quique Setien said he did not like his side's display after Barcelona were given a major scare by minnows UD Ibiza in the Copa Del Rey.
The Barca boss saw his side fall behind to the Spanish third-tier side through Pep Caballe's first-half goal but were saved by two Antoine Griezmann strikes in the second period.
It could have been an embarrassing evening for the La Liga champions as Ibizia hit the woodwork and had a goal ruled out in the first period, while the Catalan club failed to register a shot on target before Griezmann's first goal of the evening.
Barcelona manager Quique Setien was left unimpressed by his team's performance in Ibiza
When asked about his team's performance on Wednesday night, Setien said: "No, I didn't like the team.
"I would've preferred that it was all done in a different way. But at a ground like this, it's more difficult.
"They were aggressive and intense in defence, it wasn't easy. We're taking conclusions for the future. When you do things badly, that's when you can improve things."
An injury-time goal from Antoine Griezmann edged the La Liga leaders past the third-tier side
A first-half goal from Pep Caballe gave Ibiza a shock lead which they held until the 72nd minute
Defeat would have been a disaster for Setien in his early reign and he was angered throughout
Setien's settling-in period at Barcelona could have hit a snag had Griezmann not saved the day for the La Liga giants.
The Barcelona coach could look at Ibiza's artificial patch as a reason for a lack of fluency in his team, which featured first-team stars including Griezmann, Ivan Rakitic, Frenkie De Jong and Jordi Alba.
But Setien added that the Copa del Rey's new format where cup ties are now one-legged instead of two made a difference on Wednesday evening.
He said: "Losing and drawing is always an option. Even more so when it's just one game.
"If we'd have had a return leg at our place, it would have been another thing. These matches are different, they're traps.
Barcelona were outfought and sometimes outplayed by Wednesday's lower league opponents
"This is a very important match for them and they gave it their all."
Barcelona move into the last-16 of the competition looking to fight for a highly-coveted treble during the season run-in.
As well as progressing in the Spanish cup, the Catalan club sit joint top of La Liga with Real Madrid, while they face a Champions League last-16 tie at Serie A club Napoli in February.