Last year (2015), I sent a message (containing lots of proofs of excessive injuries occurring in the game) to someone from Nordeus who was on the forum during a small period at that time.
I have noticed a trend; on the first season, a user seem to have very few injuries from matches, but on the second or the third season, injuries occur a lot and sometimes in batches. Also, when an old account in 'revived', very few injuries occur in the 'first season', but on the second season there is a lot of them and they are 'lengthy'.
While injuries don't seem to occur in training on the new browser version (2016), there is still a lot of injuries occurring in matches, and the injuries are 'lengthy'.