Both youngsters have been linked with Inter this week.
Mancini said, “Gabriel Jesus is a prospect, he'll become great. Joao Mario is similar to [Marcelo] Brozovic, he can play in a lot of roles.
“Will Stevan Jovetic leave? That's not a question for me. He's an Inter player, and he can do better in his second season. I don't know what will happen.
“A Coach has to think about everyone, from the President to the players. I consider the base of the squad to be unsellable, and you know who they are.
“As for the rest, I'm not the person to answer that question."