^^^
I save packs here and there, if there a 2 day injury after last game of the day, 3 hours before the server daily refresh, there's not a good reason not to save 4 packs. Injuries player is over 21? He won't gain so much from training the condition he's losing anyways, so let him sit a bit. Don't rush to heal everything, consider the green pack or time cost to recover lost condition vs red pack supply.