Dr Helmut Marko played down the 'team order' issue, telling Austrian broadcaster ORF that the main thing is that the pair "must not interfere" with each other's races.
"They both know that what is critical in the last five races is to finish the race, and that is by having no crashes, no spins or anything else," he said.
And Marko said Webber can still win the title.
"He is 60 points behind but there are still 125 to get," said the Austrian.
Former F1 driver and now Sky commentator Anthony Davidson, however, admitted he would be "very surprised" if Red Bull didn't order a position swap in the event Webber is leading Vettel late on Sunday.
Team boss Christian Horner denied the charge.
"No. Both drivers are free to race," he said.
"We ask that they give each other space and the target is for both of them to beat Fernando (Alonso) and score as many points in the constructors' championship."
Webber, meanwhile, is quoted by Brazil's Totalrace: "We'll see tomorrow (Sunday), but I think we should be free to race."