Froome, crowned champion for the third time in four years in Paris on Sunday after a dominant three weeks, will ride the time trial and road race next month in Brazil.
"That's the plan at the minute. The season-long plan was Tour, on to the Olympics and on after that to the Vuelta. That's still the outline at the minute," Brailsford said on Tuesday on Sky Sports.
"As we go through the next phase with the Olympics, we will assess it as we go along. All being well, that's what we will be doing."
Froome arrived in Spain last year hoping to become the first man to win the Tour de France/Vuelta double since Bernard Hinault but pulled out after crashing on Stage 11.
While Froome is Sky's undoubted team leader, Mikel Landa will be expected to challenge strongly at the Vuelta which begins on August 20 and features 10 summit finishes.
"The plan is for Mikel to do it and we will assess where he is at. I think he needs another race before the Vuelta, so we will see where we are at," Brailsford said.
"It's his home race and a lot of the race is around his home town and up in the north of Spain, and we have big ambitions for him as well."