Barca were comfortable 3-0 victors on Saturday.
Koeman reflected: "I'm really very happy about the performance as I think we did well against a team who had done more work in pre-season because they started sooner than we started," he said.
"I think we played well and had good ball possession. We scored two great goals in the first half and, in the second, we controlled the game and had even more chances to score more goals.
"We gave minutes and game time to several players and, overall, it was the standard that we like to show."
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