SAO PAULO, Brazil - Sebastian Vettel has dampened speculation he is set to jump ship from Red Bull to Ferrari in 2014, saying he is "extremely committed" to the team which helped him win a third consecutive Formula 1 title.The exact nature of Vettel's contract with Red Bull is unclear but Vettel said he was tied to the constructor until the end of 2014.'NO POINT' IN SWITCHINGVettel said: "I have a contract until - I think you know better than me - at this stage, until the end of '14. I'm very happy with what we have achieved so far and I don't think this story is over yet. I'm very happy and extremely committed to give everything I have, also in the next years when I'm with them."I don't see any point in thinking about another team or something else. I'm extremely happy where I am. It's incredible what we have achieved."Ferrari team principal Stefano Domenicali said in June 2012 that Fernando Alonso and Vettel "could easily co-exist together".''MOST DIFFICULT TITLE'Alonso, narrowly beaten to the title by Vettel at the 2012 Brazilian GP, has a contract with Ferrari to the end of 2016 and is very much the No.1 driver over Felipe Massa whose contract will run until the end of 2013.Vettel said winning his third title had been the most difficult with difficulty asserting himself in a topsy-turvy 2012 season that began with seven different winners in as many races. The 2012 Singapore GP proved the turning point; from there he went on to win four races in a row to take the lead from Alonso at the 2012 Korean GP."I think it was (the hardest title) because people tried everything, inside the lines, outside the lines, to beat us and the number of questions we had to deal with, stuff we had to deal with throughout the season, didn't make our lives easier," he said."The key was to remain ourselves."