PSG's Marco Verratti looks dejected during theirChampions League quarterfinal second leg match against Barcelona at the Nou Camp in Barcelona, April 21, 2015. [Photo/Agencies]

Ibrahimovic correctly had a goal ruled out for offside in a rare attack from the French side before Barca doubled their lead when Alves swung in a left-footed cross and an unmarked Neymar headed home.

Barca lost some of their dominance when Iniesta was replaced by veteran Xavi at halftime.

Yet apart from a strike from Verratti that went wide and a powerful effort from Ibrahimovic that was saved by keeper Marc-Andre ter Stegen, PSG caused few problems for the Barca defence.