Vettel, whose second consecutive drivers' title was followed a week later by Red Bull's constructors' crown, said "scenarios" could come into play on Sunday as Formula One's dominant team target a clean sweep of honours.
A one-two season finish for Red Bull would add the coup de grace to their superlative season in which Vettel has won 10 out of 16 races and started from pole position 12 times.
"We've seen this year in particular, races are long and a lot of things can happen in the beginning but also the end, overtaking is definitely possible," said Vettel.
"So the race order may not be clear, five or 10 laps to the end. For sure it depends where you are. So we worry first of all to make sure we're in a strong position and then I think the scenario situation comes last.
"I think that's also the easiest one to manage in that case."
If Vettel does let Webber overtake, it would constitute a role reversal for the Australian, who has long chafed at team orders forcing him to play a support role to his young team-mate.
"I would love to see Mark finishing second, it's good for us as a team. I think we had a strong season so far and that would be the best way to finish such a fantastic season," Vettel said.
Vettel hints at letting Webber pass him
Advertisement