Ferrari president Sergio Marchionne has played down Ferrari's impressive start to pre-season testing ahead of the 2015 Formula 1 World Championship, saying its form will only be determined at the upcoming Barcelona tests.

Ferrari, which will have four-time champion Sebastian Vettel teaming up with Kimi Raikkonen, stole the headlines during the first F1 test of the season in Jerez, topping three of the four days and emerging 1-2 on the overall timesheets.

Though it is generally considered that other teams - notably Mercedes and Williams - were not focusing on lower fuel, faster laps, Ferrari's consistently quick pace caught the eye regardless.

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Even so, Marchionne says the four days in Jerez are merely a teaser of what is up ahead and suggests the upcoming two tests in Barcelona to provide a greater indication of where Ferrari features amongst its rivals.

"I am encouraged by the performance of the new car, though it is one thing to do a quick lap, another to do an entire race," he told the BBC.

"I have so much confidence in the work of the boys. I am proud of their work. Now we'll see when the World Championship starts in Australia. I do not expect miracles, but it is important to see progress. At the Barcelona test, I expect the ultimate proof of what we have done so far."