Kimi Raikkonen says it 'won't be the end of the world' if he doesn't extend his stay at Ferrari beyond the 2015 F1 season as pressure mounts on him to improve his results.

The former champion, who rejoined the team he won the 2007 F1 World Championship with last season, endured a difficult time in the Ferrari F14-T, failing to mount the podium and finishing down in 12th position overall, well adrift of team-mate Fernando Alonso.

With Alonso departing for McLaren and being replaced by four-time champion Sebastian Vettel, Raikkonen comes into the 2015 eager to mount a more convincing challenge in the SF15-T

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However, with his current contract set to end later this year, Raikkonen says he isn't giving his extended future much thought at the moment. Furthermore, though he claims to have an option on a new deal, he admits there are no guarantees that either side will enforce it.

"There is an option on my contract," he said. "It's up to me and the team to do a good job this year, and if it goes badly and I don't sign it, I don't sign it. It won't be the end of the world.

"The aim is to do well, and there's a big chance. If everybody is happy then I am sure we can do well. We'll see what happens in the future. I don't worry about it or have to think about it. We'll find out at some time."

Ferrari enjoyed a positive start to pre-season testing in Jerez, with Raikkonen setting the fastest time of all, just ahead of new team-mate Vettel. Two drivers that share a relatively close relationship, the Finn is happy to have Vettel on board for 2015.

"We have a good relationship so we can push the team forward. Of course we will try to beat each other on the circuit, but I'm sure we'll have some fun.

"The atmosphere already in the team is very good. Hopefully we'll get some good results this year, it can only help the situation."