Sebastian Vettel says he will make an announcement on his next move "very soon" after confirming he will leave Red Bull at the end of the season.

Vettel had one year still to run on his contract, but has decided to leave the team at the end of 2014 having won the last four drivers' world championships. While Vettel is set to move to Ferrari, in thanking Red Bull for the success he said his 2015 plans would be revealed in the near future.

"After 15 very enjoyable and successful years with Red Bull, I have decided to leave Red Bull at the end of this year," Vettel said.

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"Of course it is a big step and hard to make such a decision. The chance to drive in F1, the first win with Scuderia Toro Rosso, the four Championship wins with Infiniti Red Bull Racing and many other great memories have bound Red Bull and myself together into a kind of family. No one can take these times away from us.

"Now I have decided to take the next step in my career but first I would like to express once again big thanks to Dietrich Mateschitz, Dr Helmut Marko, Christian Horner, the whole Red Bull Family, Infiniti Red Bull Racing and Scuderia Toro Rosso. I would like to thank everybody within Red Bull for their confidence in me, trust and great support over the last years.

"About my future plans, there will be an announcement very soon."