Sebastian Vettel says Ferrari can still improve further when the summer break ends as the Scuderia battle for titles.

Vettel is the current championship leader, with the German holding a 14-point advantage over closest rival Lewis Hamilton of Mercedes.

However, Ferrari are behind the Silver Arrows in the team standings but Vettel is confident his team can make the necessary improvements before the season resumes in Belgium at the end of the month.

"We've been competitive every track where we've gone," says Vettel, as reported by Eurosport.

"It's true that Mercedes has here and there been more competitive and we were a little bit behind.

"It's normal from track to track there's a bit of a difference. For drivers, some tracks we like more than others so it's the same for the car.

"It's normal it's up and down but that's not our target - we want to be the best on every track we go. That's not the case yet but we're working on it.

"We have quite a good understanding of what the car needs. Now we have the time to look into a couple of things with a bit more peace and calm and try to improve."