My usual formation is the classic 4-4-2, so I don't really go looking for attacking midfielders or defensive midfielders. Having said that, some of my players have secondary positions, and so if I decide to change my formation for any reason, I have the defensive midfielders to cover all 3 positions, and I also have the two wide attacking midfield positions also covered. So the only position I have no player for is an AMC.

My Squad (For 4-4-2)

GK x 2
DL x 2
DR x 3
DC x 5
MC x 5
ML x 2
MR x 2
ST x 3

The alternative positions:

DML x 1
DMC x 1
DMR x 2
AML x 1
AMR x 1