Ferran Torres had Barca ahead at Montjuic, before PSG fought back through goals from youngster Senny Mayulu and Goncalo Ramos.
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Kounde later said of why PSG won: "I think ball control, they were physically superior.
"We didn't manage to press as we wanted. Also note that they gave a very good performance. Not surprised, we knew the quality of this team which is full of confidence, which has quality players.
"Today they showed that they were European champions. They were simply better tonight."