Ferrari number one driver Fernando Alonso has insisted his decision to skip next week's Jerez test is the correct one.

The Spaniard has decided to sit out the first pre-season test to 'intensify his physical training' and so that he can 'step back' and 'prepare a bit' so that he is '100 per cent' for F1 2013.

"The first test is a general test in which one checks that all the components are put together properly. Given the short amount of time available, we have decided that I will concentrate on the following tests: testing in Barcelona is more useful for measuring performance as well as being a circuit we race on," he explained to reporters today at the launch of the new Ferrari F138.

"In the meantime, I will continue with my preparation and will of course follow the Jerez test, keeping in touch with Felipe [Massa] and Pedro [de la Rosa] and analysing the data acquired by the engineers.

"To be 100 percent fit, from now until November, will require combining training and resting."

As for the season ahead, Alonso thinks it will be very different to the one just gone and he expects the top-three teams to reassert their dominance.

"I think it will be very difficult to repeat what we saw last year with seven winners in the first seven races. That really was a one off with the new regulations," he stated. "Now with things much more stable, as we saw at the end of the season, we will see the top teams emerge once again.

"The teams that have consistently won in the last few years came through [as 2012 went on] and I think we will have two or three teams that will win all the races this year and we have to be one of those teams."

Meanwhile, when asked about the new car, Alonso gave little away: "I can't say if it's a nice car or if it's good enough to make the difference, because tenths are not visible to the eye, you need to see them from the cockpit. All we can do is concentrate on testing."