Having lost his Red Bull-funded Toro Rosso race seat at the end of last year, the 23-year-old was thrown a lifeline when he became the energy drink squad's official reserve driver.
But with race seats potentially up for grabs all the way through the 2013 grid, including at Sauber and Force India and also Caterham, speculation has linked Buemi with a possible return to action.
"I don't want to always be the third driver," he is quoted by Blick newspaper.
The report said Red Bull has offered to keep Buemi on board as its reserve, test and simulator driver.
"Yes, we are more than satisfied with Sebastien's work," agreed Red Bull driver manager Dr Helmut Marko.
"But if he can go racing somewhere, we are not going to stand in his way."