I suggest any of the mods get this sticked asap here as this can be a handy guide to anyone that complains about the high rate of injuries that are on this game, that injuries can be managed better when they occur.

Another way to reduce injury rates to your best players is "not fielding your strongest players in matches considered as dead rubbers" (for example: Top of the league by 10 points and 3 games remaining, already qualified from your CL group with 2 remaining games, 2nd leg of a cup game or CL game when your leading or losing by a large scoreline such as 6-0.)

Also when "tanking a season" (failing to win promotion on purpose) it would be a waste of red packs to heal any of your players since your not going to promote and therefore any injuries in this instance would be best left to heal naturally since the red packs will be better saved for the next season as you would begin playing competitively once again. During a tanked season it would be highly advisable to farm for as many extra reds,blues,greens boosters as possible regardless of player condition.