Heikki Kovalainen admits he once again heads into the festive period with an uncertain future as rumours persist over Caterham's line-up for the 2014 season.

The Finn is one of the names in the mix for a drive with the Leafield-based outfit, although reports have suggested that Swede Marcus Ericsson and former Sauber man Kamui Kobayashi are now in pole position to take the two race seats.

That would leave Kovalainen, who failed to score when subbing for Kimi Raikkonen at Lotus in the final two races of 2013, on the outside looking in once again.

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Despite seemingly slipping down the list of potential drivers, Kovalainen confirmed that talks with Caterham were still ongoing but said it could be some time before he knew what he future would hold.

"I have been maintaining my training programme for Formula One as much as possible," he told MTV3. "I will have a normal F1 driver's winter. The only difference to previous years is that I do not currently have a contract for next season.

"But this has happened more than once in my career, when I didn't know what awaited me for the future but eventually I had something.

"The most serious negotiations are with Caterham. But all the different factors need to come together. In any case, it should be clarified by the end of January, when the tests begin. But I am not going to end my career."