The 1-0 win was earned via teenage Ansu Fati's goal.
Afterwards, Sergi said: "A huge win. We played pretty well. We were calm. In the second half we showed more patience and used that to play wider and create danger down the wings. That was key."
On Fati, he continued: "We are a team. But a scorer like him helps everyone do their jobs better. It's vital that he's got that vision of the goalmouth and how to put the ball away."
Sergi was also happy to get Ousmane Dembele on the pitch for the first time this season.
"We put him on earlier than we'd told him he would after so long out. But he makes such a difference – he plays at a different tempo, he's very direct, he stretches things."
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