The 4-2-3-1 is typically a problematic system for Liverpool whenever they come up against it because of the natural overload it creates in the build-up versus Liverpool’s press. Manchester City, Napoli, Flamengo, Spurs and Ajax have all had success against Liverpool using that system (amongst other teams I’m sure I’m forgetting). Manchester United also typically play this way, but never have done against Liverpool because of the difference in quality over the last few years. The 4-2-3-1 represents a high risk-high reward approach as the system plays into Liverpool’s hands because of their notorious pressing (assuming the opposition play out from the back, which is what United do). As a result of this, Solskjaer always felt that a low block was the best way to play against Liverpool because he didn’t trust his players to play out of Liverpool’s press.
“Sometimes we’ve struggled more in games where we’ve had to break teams down. I can’t see Liverpool coming to park the bus – that’s just not in their mentality. So I can see it being an open game, which will suit us.” (@talksport, @metro).