Stop guessing, and thing about your data structures.
So the Game class contains a List of players: get it into a variable:
List<Player> players = game.PlayerList;
Now us that to retrieve the specific play you ar einterested in:
Player player = players[turnloop];
Your Player contains a list of ... no idea what ... :
List<IDunno> theList = player.playerturn;
Now fetch whatever it is from that:
IDunno whatEver = theList[playerturn.Count - 1];
Then do whatever it is you have to with that!