N'Diaye arrived at the Stadium of Light last January and was sent on a season-long loan to Turkish side Eskisehirspor at the start of the season by then manager Paolo Di Canio.
Poyet has now claimed that the Turkish outfit want to cancel the loan deal early - but he is uncertain on whether to allow this to happen.
The Uruguayan told the Sunderland Echo: "It's a situation that if everybody agrees and it's good for everyone, then we will be happy to help him. But I don't think it's done yet. They are talking because they probably want to do it.
"But it's a very difficult decision for us. The club (Eskisehirspor) might be struggling to pay him, they might not want him or the player doesn't want to be there.
"If you agree with one or the other, it looks as if you're trying to push him.
"We've said 'put everything on the table' because it's their problem, it's not ours.
"And if they have done well and everybody's happy, then we're happy to do what is best for the player.
"It's important for the football club and important for the future because we paid a transfer fee for him. We'll either be looking to use him or get something from him."