Barcelona coach Ronald Koeman was unhappy with their performance for victory over Dynamo Kyiv.
Barca won Wednesday night's Champions League clash 2-1.
"We started the game well, quickly going 1-0 up with the penalty and with chances to score more," said Koeman. "But little by little we lost control of the game. They created a lot of danger at moments but thanks to Marc (ter Stegen), who was phenomenal (they didn't score more). In the end, 2-1, complicated, above all without the ball was not good today.
"For me the problem is sometimes you can't press ... and if you do press you leave space to play. If we press, everyone has to press, the defence high, and I think there have been doubts there. They played well and created a lot of danger."
Asked if this was a trend of a one-off, Koeman added: "In general, we've been OK defensively. In no game has a team created the danger that they did today. But without the ball we have to improve."
