Kimi Raikkonen says Ferrari should be given credit for the improvements it has made in 2015 across the board and not just in terms of its engine gains.

Compared with the 2014 season, Ferrari has made the most notable stride compared with its rivals in 2015 having established itself as the closest and most consistent threat to Mercedes throughout the season.

However, while many have particularly praised the gains of the car in terms of engine power, most notably Niki Lauda, Raikkonen insists Ferrari has made significant improvements everywhere since 2014.

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"I think we improved in all the areas, not just in power," he replied when asked about Lauda's comments. "Since the end of last year we improved a lot but we still have a long way to go to be exactly where we want to be.

"Mercedes is ahead of us, but I don't think there's one area where we have been improving more than in others.

With this in mind, Raikkonen is optimistic that there is yet more to come from the Ferrari package that could see it get on terms with Mercedes.

"I think it's the whole package that has improved, but there's work to be done in all areas before we can be happy. The rules are the rules and I'm sure we can make another step for next year. If it will be enough I don't know, we'll see next year."