Sanchez has spent the season on loan with the Serie A side and various reports suggest they are open to a permanent deal.
Marotta said: "We must remember that he was absent for months because of an injury that affected him.
"Today he is showing his qualities, which we did not just find out today.
“He's an important player. It is premature to talk about the future, his rights belong to United.
"We will also evaluate his future with the coach, however, thinking that he is not our player and we will have to buy him."
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