I have found that if you tell the player that you are going to transfer list him in the private chat, and then offer him to clubs at about 1.5 to 2 times his 'value' you will get the fair few offers and usually good ones at or above the player value.
Get the latest patch, there was a transfer bug they fixed.
Offer your players out, as stated above. No one wants them? Offer them for less. You've gotta realise however that sometimes you just won't get as much as you want for your player, and if you don't take the bid then, all future bids will be less as the player value decreases.