So his club has accepted the offer but the player doesn't want to talk to you?
There are a few things you could try, but they are all longer term:
a) keep declaring interest in the press
b) Set him as your 'Top Transfer Target'
c) Go and watch a game or two, send your Chief Scout and/or DoF to watch him
Eventually he might see how bad you want him and come around.
Look into his agent, do you have players already with the same agent? Can you get them to talk to him?
Your players in the same International squad? Try and get them to talk to him
Ultimately though, if he is not interested in signing for you, he won't.