Ferrari's Kimi Raikkonen accepts the blame for Day Four crash in Bahrain

The Finn ensured the four days of running finished under a red flag after he caused significant damage to the front of the F14 T.

"I spun, hit the wall and that is it," the Finn told the media when asked what had happened. "I spun on the kerb at the exit of turn 4, these things can happen! Luckily, it was right at the end of the day, I'm only sorry because it means the team now has more work to do."

Raikkonen's accident came on his 82nd lap of the day and, with Ferrari currently sitting third in the pre-season mileage charts, the Finn admits he is pleased with how the Scuderia's preparations are progressing.

"I think they are not too bad really," he added. "Obviously there are a lot of things to do still, but I can only look at our own situation - we don't know what the others are doing and are not really interested in that at present.

"We will see exactly where we are at the first race. The reliability aspect has been okay for us, but speed wise I don't know where we are, but we will keep doing our work and hopefully find out we are more or less where we should be. I think it is pretty okay right now, but for sure we want to improve things and there is still a long way to go before the season.

"You always want more laps, but we didn't have any problems and then I damaged the car with the crash. There were a lot of red flags, but we did more or less what we wanted to do. We could do long runs, but the plan was to do something else."

The 34-year-old missed the final two races of the 2013 season to have surgery on a long-standing back injury - reported to have been caused by a testing accident in 2001 for Sauber - but the Finn insists he is now fighting fit once more.

"It has been okay since I had the operation and hopefully it stays like that," he said. "With these things you never know, it has been there for a long time and some days it is good and the next day it might not be. It is one of those things, but it has been much, much better."

Fastest laps of Bahrain Test One
1. Nico Rosberg, Mercedes, 1:33.283, Day Four.
2. Lewis Hamilton, Mercedes, 1:34.263, Day Three.
3. Kevin Magnussen, McLaren, 1:34.910, Day Two.
4. Jenson Button, McLaren, 1:34.957, Day Four.
5. Nico Hulkenberg, Force India, 1:36.445, Day Two.
6. Fernando Alonso, Ferrari, 1:36.516, Day Two.
7. Kimi Raikkonen, Ferrari, 1:36.718, Day Four.
8. Felipe Massa, Williams, 1:37.066, Day Three.
9. Esteban Gutierrez, Sauber, 1:37.180, Day Three
10. Valtteri Bottas, Williams, 1:37.328, Day Two.

The third and final pre-season test starts on Thursday morning in Bahrain. The Sky Sports F1 Online team will be providing live commentary from dawn until dusk on all four days, with live updates from trackside also on Sky Sports News.