On my server no matter whom I sell on the 1st day, they get sold in one go. Maybe ur server don't have active buyers. Sell him for the lowest cost possible. But no guarantee. Maybe spent 1T and Change his name to someone famous like Mess I, Ronalo, Rooney if he I forward, Xvi, Iniesta if he is mid or Terry, Ramos, etc if he I defence. If he is GK, Peter Cech or Csillas will do. If there r many Turkish bidders on ur server, put any Galatasray player
There is no sure way of selling but what I just told u mostly works