Thomas Tuchel is unsure of Adrien Rabiot's future at Paris Saint-Germain amid reports the midfielder has rejected a new contract.
Tuchel hopes to keep Rabiot at the club but told Canal Plus : "I'm not certain he will stay. I want him to stay but it's up to him.
"He has great potential and can improve even further. He can become a top player but has to stay with us."
Although Rabiot may be on his way out of PSG, the club's next looks set to be Thilo Kehrer, with Schalke having confirmed the 21-year-old is on the verge of joining Tuchel's side.
"We're in contact with him but it's not signed yet," Tuchel added.
PSG have until the end of the month to solidify a deal for the defender.