I simmed a match and started reading the after-match report. One of my players got an injury in the match and the little red icon in the mailbox lit up.
Before leaving the match report normally, I clicked on the mailbox icon (to see how long the guy was going to be out), and I found out that the green Continue button was replaced with the same "PLAY GAME at Reading" text that I had clicked just a moment earlier to start the match. I clicked on the PLAY GAME button, but FHM told me that I can't start the match because I have an injured player on the roster. I had to replace the injured guy and then replay the same match with fatigued players.
As a result, I now have played 2 matches on the same day against the same opponent. I'm sure this isn't unheard of in the real ECHL, but I don't think it's supposed to work like this in FHM.