Auto subs - How does it work?

[dv8r]

I thought the slots were for players being subbed on. E.g. In your substitutes you have 2 MCs, then put them both in the midfield slots. Then if a MF player gets injured, they will be replaced by one of these two players.

EDIT: Just watched the tutorial video and you do select your spare players that you would like to be subbed on as the ones that go in the slots.

Are you sure? I thought it was the ones who go off..Damn it lol, I've been wrong this whole time