"If we do a good job, maybe one of us will go to Red Bull, provided there is a free space," he is quoted by France's L'Equipe.
"It would be great, but it's only in the corner of our minds," added the 22-year-old.
Needing to impress in 2013, a lot is therefore riding on Toro Rosso's new STR8.
"Without going into detail," Vergne is quoted by the French news agency AFP, "there were many things missing with the car of last year.
"It was difficult to drive and mechanically they could not resolve it.
"If you listen to the other teams, all the drivers think they have the best car, that they are the best and they will win all the races. So I won't go there," he smiled.