Sebastian Vettel admits that the only reason why he continues to talk about racing for Ferrari during his F1 career is because he continues to questioned about whether or not a move could take place.

The defending F1 champion re-signed with Red Bull earlier this year in a move which went some way to playing down the continued speculation linking him with a switch to Maranello.

That hasn't stopped Vettel from being questioned about the matter and the German said the continued questions were the reason why he still discusses the possibility of a move to Ferrari before his career is at an end.

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"If I talk about it so often, it's because I'm often asked about it," he told Autosprint. "In fact, there are two reasons - first of all Ferrari is something special, as I've said many times.

"The second reason is that I have to reply to whoever asks me about it. It's a self-feeding situation.

"For me, Ferrari is a legend and, one day, it would be an honour for me to have my name on the list of Ferrari drivers. But that doesn't mean I want to go there now - I'm happy where I am and this is why I've renewed for a couple of seasons."

Vettel's new deal with Red Bull takes him through to the end of the 2014 season, and he admitted that reassurances from the team about its structure had been key to him taking the decision to extend his contract.

"It is about all the team, not just me or one other person like Adrian [Newey, technical director]," Vettel said. "We are a group and we are together and that's why I decided to stay and extend my contract by a couple of years more."