Ferrari say they are lagging behind rivals Mercedes and Red Bull at the halfway point of pre-season testing.
The admission from team boss Mattia Binotto came as Sebastian Vettel suffered the first mechanical failure of testing with an engine failure.
Binotto said: “I am not as optimistic as last year so it means the others are faster than us at the moment.
“How much faster it’s really difficult to judge. We will go through all the data.”
The first of two three-day pre-season tests came to an end on Friday at Barcelona’s Circuit de Barcelona-Catalunya with Mercedes drivers Valtteri Bottas and Lewis Hamilton topping the timesheets.
Bottas set the fastest time of the winter, 0.8 seconds quicker than Hamilton and well over a second quicker than anyone else managed.
The Finn said: “We’re only halfway through the testing and I can say it has been a good feeling, no massive balance issues with the car, the behaviour has been pretty good, and I feel we’ve made good improvement every day with the car and that was the goal.”
Vettel was 12th fastest overall after suffering an engine failure midway through the morning session that curtailed his running until the afternoon.
Ferrari have focused on producing a car with more downforce this season after lagging behind Mercedes for much of 2019, in which they Italian team could win only three races.
Asked if this year’s Ferrari was a Mercedes-beater, Binotto said: “It’s a very early stage to decide. I think Ferrari will be a (Mercedes) beater if you consider the overall of the season. Will Ferrari be a (Mercedes) beater already (at the first race) in Australia? Maybe not.
“I’ve seen certainly Mercedes, and Red Bull, very fast in these first days. But I think we will assess the true performance only next week or in Australia. And that will be true performance to start the season with, knowing that 22 races are very long and everything may change.”
The second pre-season test is at the same track from 26-28 February.