One can understand that from this sentences, but at the beginning of this post has been explained the right meaning: with the old injury system your player would have been injured for 4 weeks, and with the new system injuries are shorter than before. What it was 4 weeks, now it is 4 matches = 2 weeks. And that is what you got.
I hope it is clearer now.
(of course the original sentence was ambiguous, at least for non native english speakers)
¡Me aburro! (Homer Simpson)