I was fairly certain that you had to have at least one player per flank?
I had an early 1-0 lead against a poorer team and then he changed to this formation and scored to goals. I'm a bit miffed, not really worth getting worked up over but a wee bit frustrating as I could've held on to the League lead if this hadn't happened. Had a 3% home advantage also since he had some friend watch the game with him.