Ronald Koeman thanked "phenomenal" Marc-Andre ter Stegen for his part in Barcelona's narrow 2-1 win over Dynamo Kyiv and acknowledged his side have plenty to work on.
The Catalan giants made it three wins from three in Champions League Group G through Lionel Messi's fifth-minute penalty and a Gerard Pique header in the second half.
However, Barca needed Ter Stegen to make six saves against a Dynamo side depleted by a coronavirus outbreak in their camp, including a top-class reaction stop to deny Vitaliy Buyalskiy.
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Viktor Tsygankov eventually found a way past Ter Stegen, who was making his first appearance of 2020-21 after recovering from a knee injury, but Barca saw out the victory.