Second-half goals of Arda Turan and Gerard Pique completed a comeback win for Barcelona who went behind after Thorgan Hazard gave the hosts the lead in the first half.
SUBS: Vestergaard, Herrmann, Johnson, Sippel, Hofmann, Jantschke, Hahn.
GLADBACH (4-2-3-1): Sommer; Korb, Christensen, Elvedi, Wendt; Kramer, Dahoud; Traore, Stindl, Hazard; Raffael.
SUBS: Denis Suarez, Turan, Rafinha, Cillessen, Digne, Gomes, Mathieu.
BARCELONA (4-3-3): Ter Stegen; Roberto, Pique, Mascherano, Alba; Rakitic, Busquets, Iniesta; Alcacer, Neymar, Suarez.