if your player is 42 and 5* then he goes on normal transfer list which you need to do if you want to sell, the player needs to be 44 rated and two skill point`s off 45 ( 6* scout ) and he will auto go negs list for other`s to bid and when someone does it will show on your squad list with a hammer beside them

edit if goes on normal market if someone bids then he`s sold no matter what