How to beat an assymatrical 4-4-1-1?

[Pierre Lee]

This guy here plays with the conventional back four of dl dc dc dr, has 3 mc's and a mr but no ml
he then follows this up with an amc and a st
Is this formation illegal? and if it isnt, how do i counter such a formation, since its assymatrical.

This is how it looks like:
_____ST_______________
_________AMC__________
_____ MC_MC_MC__MR___
______________________
_DL__DC_____DC___DR__
_________GK___________