Barcelona coach Ronald Koeman says they must react after their Champions League thrashing by PSG.

Koeman has accepted the nature of their defeat and wants his players to react when Cadiz visit the Camp Nou on Sunday night.

"It's true that after a defeat, it's good to have another game to show that we can get a good result," Koeman said during Saturday's pre-match press conference.

"We have to keep going. We have a good record. We have ambition.

"We know what happened to us and we have to react."