Despite Palhinha's comments, Silva says he has little control over the 28-year-old's future and would not rule out a possible departure in January.
"I cannot control the future - and not just about Joao. When you receive some big offers, and the size of that club, there will be more noise around," Silva told reporters.
"What is going to happen in January or next summer I cannot control. The club has the control. He can keep playing and be a key player for us."