My shortlist changes constantly from season to season, as I tend to have several ready, and future, players for a given position. I can go several seasons without buying/selling a player, but when I hit a season where I need to bring in player(s), I tend to have between 20-30 options for that given position that I monitor during the season. After the season, during the summer window, I then narrow it down to 3 options with whom I try to enter negotiations.