Players are transfer listed constantly but you are only able to see a part of the whole transfer list every time you log into the game. With each re-log you get to see a different part of transfer list. This is done in order to prevent cheating and to prevent swapping players between fake teams. If you wish to save a player you liked on the TL, either place a bid for him or add him to your favorites. Placing a bid will automatically put that player in your favorites list, allowing you to see him in the next log in.
You can read this in the "help". But, this part is not totally correct. When I re-log, mostly don't change. Only appears a new player to replace another whose auction has already ended. The whole list only changes a very few times, but I don't know what is the requirement to change.

My question is: what have I to do, to force the change of the transfer list?

Thanks