Sebastian Vettel says he has nothing to prove after announcing his departure from Red Bull.

Red Bull team principal Christian Horner confirmed Vettel is set to join Ferrari next season after cutting ties with the team with which he has won four world titles. While he has been beaten by team-mate Daniel Ricciardo so far this season, Vettel said the lack of success this year was not a factor in his decision to move.

"That's one way to look at it but I don't feel I have to prove anything here," Vettel said. "I think everything we achieved we achieved together. Surely this season didn't go as we wanted to - I think especially the first half for me was quite messy. We made progress but it's a difficult one to come together such as days like today.

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"I think generally if you have the ambition to win, you can't afford to be afraid of anyone because ultimately if you want to win the championship you have to face the best people anyway. So that's not the point really."

And Vettel said it had taken him a long time to come to the decision to leave Red Bull having come through the young driver program at the team.

"A decision like that obviously doesn't happen overnight. In some ways it's a big step when a very, very good relationship comes to an end but I think you need to understand that there's nothing negative in [Red Bull] at all. It's not like I'm leaving here because I don't like it anymore or I don't like the people anymore. It's not at all like that and that's obviously what made the decision so difficult for me after such a long time and very successful time together.

"It's obviously a decision that grows with time and it's not the first time I had the opportunity in the last years to do something different but it felt now that it is time for something else. It's the right time and truly it's a big step but I'm looking forward to the challenge."

When it was put to Vettel that Horner had confirmed he is joining Ferrari, Vettel replied: "It's not the first time I've got offers from other people but unfortunately I have to give you the same answer again and again; I cannot officially announce anything but very shortly I think I will be able to. As I said, the decision I made I obviously believe in the decision. It's a step that I think will make me very happy."

And Vettel said he is not motivated by the idea of winning titles with multiple teams in order to prove himself.

"I think there's plenty of things that people say a true great driver should achieve in his life and so on; I don't listen to that. I followed the voice inside me, I followed my heart and made the decision that I felt was the right one. As I said, it was not an easy one, but it was one that I believe in and hopefully will make me very happy.

"Of course, whatever I do the ambition is to be successful otherwise there's not much point in me being here. Just going round making money maybe is great for some people but that's not my ambition at all, I'm here to win."