The Swedish striker has this week begun doing some very light ball work with the club's coaching staff at Carrington following a serious knee injury.
"(Paul) Pogba is not here I don't know when he will be back," he said.
"Zlatan is working under our control here as I would expect. He is working so, so hard but he won't be back in the next week or the next couple of weeks.
"He needs to take his time and come back in the right moment. Do I feel he will be back in 2017? Yes I do. But it's just a feeling."