i only use a squad of 17. but im a lazy manager. i sign 11 5 star players and the subs are filled with players who used to be 5 stars. my bench every season has 1 gk, 2 defenders, 2 midfielders and 1 striker. they hardly get played because if i have any injuries i just use the red packs, ill only use them if a game isnt important or i consider it an easy game.