The Argentina international has voiced his desire to leave the club this summer, but has not yet been able to find a new club.
“He doesn’t have another team,” said Mancini.
“Carlos is a professional player. If he doesn’t have another team in the next 10 days or two weeks I think he will play for us and play serious like last year, like always.
“I don’t know (if he will leave). A lot can happen in one month, but if he stays I am happy.”