Ferrari team principal Stefano Domenicali has lamented the team's inability to give their drivers "a car good enough to fight" Sebastian Vettel on equal terms.
Vettel won his sixth consecutive race at Sunday's Indian Grand Prix to wrap up a fourth Drivers' Championship on the trot, leaving Fernando Alonso to battle it out with Kimi Raikkonen over second place in the standings.
Domenicali believes they let their drivers down as the machinery was not up to scratch this year.
"This year, we were unable to give our drivers a car good enough to fight with Vettel on equal terms, apart from at the very beginning of the season," he told the official Ferrari website.
"Thanks to Fernando and his amazing talent, we managed to worry the World Champion elect more than the others, but unfortunately, our efforts were not enough to fight all the way to the very end.
"Now, it's important to try and end this season in the best way possible. These are crucial weeks that we have ahead of us to the end of the year, because the work we are doing in preparation for 2014 is vital if we want to be the team that puts an end to this Red Bull dominance, just as we and Fernando have been their main rivals over the past four seasons."
Domenicali also revealed that the team knew during the summer that they were going struggle during the latter stages of the season.
"I think honestly there were two moments when I realised that the situation was becoming quite complicated," he is quoted as saying by Autosport.
"One was around July when we saw that we didn't have the step in performance related to the upgrades that we were hoping to have.
"That was a sign of alarm I saw very clearly.
"The second moment was in the second half of the season.
"If you think about Spa and Monza the situation was not so bad if you forget Sebastian and Red Bull, but we were not able to gain with the change of tyre specification, while we saw the others did a big gain."
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