Intentional foul and sub?

Ok, everything makes sense now. I had the idea that an injured player is one who cannot return to the game due to his injury. However, outside of concussions, it does not seem to me as though the Federation wants officials to be the judges of who can and cannot play due to injury. We simply have to follow the correct substitution rules for whoever the coach removes from the game or sends to the table. No more Injury Police™.