One-lap form will be especially important in Baku as the sprint event will have its own qualifying session on Saturday, so drivers and teams will have to get it right twice.
Ferrari had the second-fastest car over one lap in both Bahrain and Saudi Arabia behind Red Bull, but it stumbled in Australia, where both Mercedes and Aston Martin were ahead.
Vasseur says that the team has to concentrate on optimising its own performance and not be distracted by rivals.
“To be focused on Red Bull or Mercedes or Aston Martin, I think it would be a mistake,” said the Frenchman.
“We have to get the best from what we are doing, and to be focused on ourselves. But we made a good step for me between race two and race three.
“And if we're able to bring a couple of updates... I think the issue in Melbourne was not the potential of the car, it was more the job that we did as a team to extract the best from this, and that we have to be focused on this.
Source: Autosport