The championship has already been sewn up by the British superstar.
Vettel, however, insists Ferrari are back on track after a challenging season.
“We have got the car back to what we know and what we feel more comfortable with at the last two races,” said Vettel.
“So hopefully we can keep that up and keep competitive here and in Abu Dhabi and give [Mercedes] a very hard time.
“Here it is always difficult to predict because in Interlagos there is something magical about this place and things happen. We will see how it turns out.”
Former F1 driver Pedro de la Rosa says Hamilton secured glory this year because Ferrari did not protect Vettel.
The German star crashed out of his home Grand Prix earlier in the campaign and struggled in China.
Hamilton and Vettel also collided at Monza.
De la Rosa believes Vettel’s team should have given him more support during the tough moments of the season.
“Ferrari have had a car at Mercedes’ level in every way for the first time in the hybrid era,” de la Rosa told Spain’s El Confidencial.
“But Vettel’s mistakes coupled with the fact that Ferrari did not protect him meant that they lost the world championship.
“In the life of a driver, when you make a mistake, but particularly when you’re at Ferrari, the team has to protect you.
“If it does not, it’s very difficult for the driver to handle the pressure generated by his own mistake.
“I remember when he crashed in Germany, it was a very strong blow to Vettel with a very prominent error.
“But I didn’t see a very strong defence of the driver. I didn’t see it.
“Then came Monza, when Hamilton overtook him dramatically and won the race.
“I think that given the pressure Vettel was suffering, I would have expected more public support from the team.
“Maybe he had it internally, but it should have been public to relieve the pressure, especially from the Italian press.
“At times like those, it’s harder to win with Ferrari.
“When it starts to go wrong, it’s very hard to have concentration and a cool head at Ferrari.”
The season finishes on November 25 in Abu Dhabi.