Rabiot played the full 90 minutes as PSG defeated Caen on Sunday evening, but the midfielder has been linked with an exit from the Ligue 1 champions with less than a year remaining on his contract.
The club's position with FFP means that a sale would likely take place this summer rather than potentially losing the player on a free in 2019, and Tuchel has suggested that the 23-year-old must make a decision.
Tuchel told reporters on Sunday: "It's not certain if Adrien stays at PSG. It all depends on him. For me he's a great player. He can grow even more and become a top player."
Barcelona allegedly hold an interest in signing the France international.