with him going 3w, id try something like 3w-1dmc-3n-1-2 going through the middle, but 3w-1-4-1-1 like factorx suggested or 3n-1-4-1-1 should work ok, too.
Going through the middle with an AMC is definitely the way to go, a dmc to counter his amc, 3w in the back against his sole striker and for avoiding an illegal formation with 3 MCs...
I prefer having the 2 strikers and one amc against a single dc, its going to be tough for that poor dc.
edit: hes probably going to play a different formation anyway as long as his MC is suspended, his remaining MCs are only 1 star so expect a striker or a DC as replacement. If he brings an extra striker, you cant go 3w defenders, so you need to go 3n-1-4-1-1, if he brings an extra dc, having 2 strikers would improve your goal chances.