Ronald Koeman claimed he has seen a "big change" in his Barcelona players compared to the way they started the season in La Liga.
The Blaugrana made it five wins out of five Champions League matches with a comfortable 3-0 victory over Ferencvaros in Champions League Group G on Wednesday.
Barca will have the chance to win all six of their group games for the first time since the 2002-03 campaign when they face Juventus at Camp Nou next Tuesday.
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Koeman's side have struggled in La Liga this season, though, and are 12 points behind leaders Real Sociedad – albeit with two games in hand – after losing three and drawing two of their opening nine games.