Law of averages it is. I've been keeping a log of injuries the last 3 seasons, and overall totals are remarkably similar - I got 6 injuries in 3 days to end last season, but still had 15 total for the season, vs 17 and 15 in the previous 2 seasons:
Insisting that probabilities have been tweaked (which invariably people do, every season) based on their team having a horror run just shows a basic ignorance of probability theory.
I average an injury every 2nd day* - annoying, but managable (OK, I can farm packs watching videos on iPhone). That's with a 22 man squad, operating on rotation so most of the time players only have 1 game a day - I'm already out of the Cup this season

, so there'll be a lot of friendlies this season. I try to have players at 85%+ conditioning going into a match, I train my players to have strong physical attributes, and I prioritise pitch improvements.
*Well, every 1.78 days to be more precise)