Kimi Raikkonen says it is his intention to continue competing in Formula 1 beyond 2016, but reiterates he will only do so with Ferrari.

Despite being comprehensively out-performed by new team-mate in Sebastian Vettel - raising speculation he would be replaced in the team earlier this year -, Raikkonen penned an extension over the summer that will take his contract through to the end of 2016.

However, despite the early assurance, Raikkonen has continued to struggle for consistent form, notching up just two podiums so far in 2015, while Vettel is now 128 points clear of him in the overall standings with three races remaining.

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Indeed, despite a vast improvement on his 2014 season, Raikkonen admits he has struggled at times in 2015 and accepts he must up his game if he wants to remain with Ferrari.

"Of course it is not ideal," he told the official F1 website. "Who wouldn't know that better than me? But this is part of the game. I have to do a better job. Last year was pretty poor, this season is much better - but it is still not anywhere near where I want to be. You make some mistakes and that's how it goes."

Looking beyond 2016, though Raikkonen has previously hinted at retirement, he insists he is enjoying his time in F1 and would like to race on, even if he says he will only likely do so in the Ferrari stable.

"It is still some time away, but I enjoy it here - and I will enjoy it even more when we get even better results. Being on top always makes it more fun. I love to be with my team and would love to fight for championships with them.

"Ferrari is the best team to be with. When I quit the first time I said that it is Ferrari or nothing - and I say it now: it will be the last team in F1 I will be with. But in the end you never know, life is rather unpredictable..."