I rotated the squad and towards the end of the season you'll be using greens to get some of your players health back to max for matches even if you do. Matchday 20 becomes a great rest day as you prepare for the crunch games. if you've got a good league draw you should have that sown up by then.
The only other thing that pisses you off at the very end of the season is injuries so let you squad cover as much as they can at the start during the champions league group phase.