Mercedes Abu Dhabi form a one-off

Valtteri Bottas and Lewis Hamilton secured a comfortable one-two for Mercedes with Ferrari's Sebastian Vettel finishing 19.330s off the pace.

Raikkonen was a further 26s adrift and said the race was "boring" and like "endurance racing" because the Yas Marina track requires significant fuel-saving.

When asked if he was concerned about the deficit to Mercedes, Raikkonen said: "I don't think so. It's just a one-off race.

"Obviously we've seen in some other races that one team is stronger than others.

"At the last race of the year obviously we want to do as well as we can but they were strong here."

Ferrari took the fight to Mercedes this season, sustaining a title challenge until Singapore when both cars failed to finish before reliability woes hit in Malaysia and Japan.

The team finished second in the championship, 146 points behind world champion team Mercedes, but it secured five wins having failed to reach the top step last season.

Raikkonen is optimistic about Ferrari's chances of challenging next year and going the distance, having had its best season since 2008.

"Next year, new cars for everybody, new things and I don't think we should worry too much," he said.

"We always try to improve in all areas and obviously be the fastest and we're not going to be happy until we are one-two all the time. But it's not going to be easy.

"For sure they were strong here but I'm not really worried for next year.

"We had a pretty strong car everywhere [this year]. Obviously some places were stronger than others. Some the other way around.

"We'll do our job and we have to improve here and there and minimise the issues and apart from that we should be up there."