Will someone please tell me why players dont always get subbed in when there is an injury????????????

I was playing Mourihno in a friendly and his MR got injured and stretchered off in the 38'....no replacement and I lost 1-0 to his 4-4-2 with my narrow diamond. He is arguably better but I kicked his butt in possession, shots, etc.

Please tell me how a team can win with a man down for almost the whole game? Sure it can happen in real life, but it has happened so many times its gone past the "real life" point.

This is not a rant. I am serious about discussing this. I would automatically think that since Mourinho is a Nordeus team they would have filled in the AUTOSUB boxes.

Can someone from nordeus please address this?