Something definatley changed with the patch. It went from completely realist to absolutely ridiculous.
I have had a player at my club for 10 years now, in his injury history he had 2 injuries over 9 years of which was 3 weeks total. Since the patch he has now got 15 injuries over 10 years of which total 15 weeks. Raheem Stirling joined us this season and the first match got a broken leg, out for 5 months. Came back and had ONE reserve game and broken his ankle and out for 4 months.
I literally have 1 to 2 injuries per match that require subs and theres always another few that pick up knocks. I cannot bring on fresh legs after 60 mins as i have always done because its a certainty i will be down to 10 men for the last 10-15 mins.
I remember this sort of thing in FM11 too so maybe they have patched in some unwanted code to do with injuries. Either way, it wont be fixed now and its a bit of a gamebreaker.