Barcelona are in a rut and need a reset after suffering a surprise 1-0 defeat to Shakhtar Donetsk in the Champions League in Hamburg on Tuesday.
Danylo Sikan scored the only goal of the game just before half-time as Barça missed the chance to book their place in the knockout stages of the competition.
The Spanish champions dominated possession but only managed one shot on target despite bringing on Pedri, Lamine Yamal and João Félix in the second half.
"We deserved to lose," Barcelona coach said in his post-game news conference. "We have to be honest. We played badly and nothing we had planned came off.
"The level of our performances is really low at the moment. This was one of the worst games of my two years in charge. We have to be self-critical.
Barcelona still lead Group H ahead of second-placed Porto, who beat Royal Antwerp 2-0, on head-to-head record, but missed the chance to wrap up qualification for the last 16 with two games to spare.
"After two years without qualifying for the last 16, today is a missed opportunity," said Barca coach Xavi Hernandez.
Shakhtar, on six points, gave their knock-out stage hopes a boost, but also put themselves in pole position to at least finish third ahead of Antwerp and move into the Europa League.
Royal Antwerp remain pointless.
"It's a shame because we wanted to book our place in the last 16," Xavi said. "We still have qualification in our own hands, though, and that's the big positive.
"We have the next game at home, against Porto, and we can seal it there. We have to restore the confidence. We're having a small dip right now.
"Not so long ago we were playing very good football -- it's a mental issue."
Barça defender João Cancelo called on the team to show a reaction on Sunday when they host Alaves in LaLiga, where they are currently third, four points behind surprise leaders Girona and two off Real Madrid.
"We have played really badly in the last two games," Cancelo said. "Against Real Sociedad, we didn't deserve to win and today we didn't play well enough to get the points.
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