Want Away Players Unhappy

What do I do with players who are unhappy because want to move to a bigger club. I've no problem leting them go but I hope to get there value worth, so how would I do that?

Thanks

Play hardball, if you have good enough teams after them they will pay eventually, also if asked and you're not keeping them say it. I find that want away players (unless they are really bad temprementally) will keep their playing level up unless you mess around with their price level too much (e.g. looking for £20m for a £5m 29 y.o.)

mate up your asking price for the club that's intrested in your player if you push it up past there vaulution they soon go away