Ferrari has identified its F1 2016 car's weaknesses

Ferrari has failed to score a podium in any of the last three grands prix and has taken just 50 points to Red Bull's 80, having been in contention for victories at the start of the season.

But Vettel, who has previously said the team needs to improve its car in medium and high-speed corners, remained positive about Ferrari's chances.

"We know that the last couple of races have been harsh and tough for us but they've been useful and we have understood a lot about our car strengths and weaknesses so we know what to focus on," he said.

"It wasn't entirely clear after the first couple of races but it became more and more evident.

"It's a harsh way to find out and we're not as competitive as we want but we know to what to do.

"It's not something to change overnight but there is a plan and the second half should be stronger in that regard.

"It also depends on what other people will do but for now that is the focus on ourselves."

When asked why Ferrari hadn't seen these deficiencies earlier in the season, Vettel said: "Some things do take time but overall the most important thing is that we are challenging ourselves.

"You are right - it would have been nicer to find out a bit sooner but that's how it is.

"The main point though is that we find out, we are always trying to improve but as I said the last races in this regard have been very educational in finding out our potential weaknesses."

Vettel added that while a lot of effort is now going on the 2017 car, ahead of the aerodynamic regulation changes, there are more developments planned for this year.

"There is some stuff coming and that has always been the plan but also like everyone else we are already preparing big time on 2017," he said.

"It is a different project and the cars will be very different but there are still some things that we can learn and understand this year which will help us next year."