The 34-year-old actress played Neytiri in the first installment of the James Cameron franchise, reported Digital spy.
"I think that they're doing a part two and a part three and they're probably going to shoot it at the same time.
"Because if we just do two and then wait, I'll probably be 45 or 50 by the time we get to part three. It takes a long time, it's a very hard process," Saldana said on a television show.
Saldana also confirmed that shooting of the film will begin early next year.