Fernandinho believes there is still room for improvement in the Manchester City side, despite their 3-0 victory against Shakhtar Donetsk taking them to the top of their Champions League group.
Pep Guardiola's side rarely looked troubled in Ukraine, with goals from David Silva, Aymeric Laporte and Bernardo Silva securing a comfortable victory at the Metalist Stadium.
But Fernandinho believes the team can work harder as a unit, especially when they are trying to regain possession.
"I think that is important [that the team operates] as a whole - not just the defenders, but the attacking players as well," he said.
"They start to press so high, they make it difficult for the opponent to make chances and get the ball to the midfielders.
"When the ball gets to our box it is a little bit easier for our defenders and the keeper as well.
"The general concept is we are in good shape and everybody now understands what we have to do. We just have to improve it more to get better."
After a surprise home defeat by Lyon on matchday one of this season's Champions League, City won against Hoffenheim in Germany before seeing off Shakhtar to leave them in a good position ahead of the return leg at the Etihad on November 7.
"Of course, after the two first games we knew we had to improve, especially in the performance," added Fernandinho.
"It was so important to start so well. They are a very dangerous team, they have good technical players. I think we did that.
"We started so strong, so fast, creating chances. We could have scored so many goals and I think we deserved the win."
Manchester City are back in Premier League action when they face Tottenham on Monday Night Football. Coverage begins on Sky Sports Premier League and Sky Sports Main Action at 7pm.