So I was readin' the wiki:

"Auto-substitutions

Auto-substitutions are there to help you when you are not able to watch your match. You have 5 available positions where you can place desired players:
GK (goalkeeper)
DEF (defensive line)
WNG (AML/AMR and DML/DMR)
MID (midfield line including ML and MR positions)
ST (striker)"

Anyone know for sure where DMC and AMC would go? I've been putting mine in the MID line, but I honestly don't know if that works.