The Wales whizzkid, 19, has been watched by Manchester City boss Roberto Mancini’s assistant David Platt in recent weeks.
Coleman said: “I hope he doesn’t move from Crystal Palace. He’s doing well and has a good manager in Ian Holloway who plays great football and that suits Jonny’s style.
“The big threat when you join a big club is you get lost.
“Look at Scott Sinclair. He is the prime example.”