Earlier this month it was reported that the 25-year-old had agreed a deal, which included an option for him to move to the Italian team in 2014.
However, Vettel has insisted that no such agreement exists and that he is very happy with his current employers.
"There is nothing to tell, nothing I have signed," he said. "It is amusing. I don't know where it came from.
"There is nothing to report and I am very happy at Red Bull Racing."
Vettel is currently 13 points ahead of Ferrari's Fernando Alonso in the Drivers' Championship standings.