If your team existed last year (as the same team with the same team #) then you can add players back to your team page via the player pool (if you added players last season).  Follow these steps to add the players back on the team page:

1. Login to team page
2. Click on roster
3. Team Player Pool
   
4. check off the players that are on the team
5. save your changes

These steps only work for those teams that entered a roster on a previous season.