Barcelona edged into the Copa del Rey quarter-finals with an unconvincing 3-1 win at third-tier Unionistas de Salamanca.
Alvaro Gomez brilliantly volleyed the hosts in front to stun their La Liga visitors.
Barcelona levelled through Ferran Torres’ cool finish just before the break.
Jules Kounde’s 25-yard strike and Alejandro Balde’s solo effort won the tie in the second half.
Hoping to bounce back from a painful thrashing by Real Madrid in the Spanish Super Cup final last Sunday in Saudi Arabia, boss Xavi made numerous changes.
He rested striker Robert Lewandowski and put youngster Marc Guiu in to lead the line, along with Joao Felix.
But, for large periods, Barca were frustrated by the side who had knocked Villarreal out in the previous round, in front of a capacity 6,000 home crowd.
