The club captain, who was their top scorer last season as they won the FA Cup and qualified for the Champions League, requested a transfer earlier in the summer as he wants to be closer to his family.
But Silva is not giving up hope of Tevez staying, and he told The Sun: "Carlos has to return and that's great. He's a very important player for us.
"I don't think we'll have a problem. We know Carlos well. If he stays, great.
"There are a lot of competitions and we hope to play well in all of them. He would help that."