When looking at the "Weekly stats", and more importantly at the "Team Stats" one cannot tell who is part of current roster and who already been sold.
One will need to go back and forth to the "Roster Page" for finding that out.
For the sake of a more user-friendly game, I suggest highlighting the players that are part of current roster at those pages.
It will do a little more good, if the players who had been part of the team from the start of the season will be highlighted by another color.