The Catalan outfit have won all eight of their La Liga matches thus far and both of their Champions League group matches.
"We are happy with the way the season has gone, but we also know there is a long way to go yet and we have to improve," he told AS. "We have won games, we have drawn games, and in some games teams have almost fought back against us.
"We have to get better at controlling games, but we've improved a lot at that recently. Tata's making us believe in ourselves again. We are keen to create pressure again and it's very important for him to get us winning balls back.
"I think he's working on these things so we can believe we can win another European Cup, and this season we are out to win another treble."
Barcelona were eliminated in the semi-finals of the Champions League last season following a 7-0 aggregate loss to eventual winners Bayern Munich.