Even this won't be enough, and in fact is not appropriate because you can still have injuries if you heal one or more of those players. Or would you deliberately stay with 3 in your squad all season? Take into consideration that you can have only 22 contracted players in the squad. Also, those 3 injuries could be to your best players.
The people concerned with this at Nordeus need to have a look at what is wrong and fix it, or maybe they already know about this, that is all this was intentionally programmed to occur to boost the business.
The occurrence of injuries in training was removed, but you can clearly see how they compensated for that by 'tempting' or 'forcing' users to train more to get more bonuses, hence spending more green packs, and so you see how they considered the business points of view. Also one person said that only one injury can occur per team per match and also a player that recently got injured won't get injured in the next matches. Yet, as you can see, injuries is still a big problem in this game, and it is not only a matter of one season only. Someone has reported this to occur for 3 seasons in another thread in this forum; I have posted an image of his post in this thread.
quit this game (23/08/2015)
started playing again (13/03/2016)
quit this game (08/08/2016)
playing (11/12/2016)
quit this game (11/01/2017)
playing (May 2017)
quit this game (23/07/2017)
playing (22/07/2018)
quit this deceiving game (24/08/2018)
playing (02/09/2019)
Final Quit; Enough is Enough (10/12/2019)