In theory it should work: An elegant, ball-playing defender and a tough-as-nails hardman stopper.
But in reality, Skrtel, despite his looks and his tattoos, is just not physical enough. And never has been. And it's not just the likes of Drogba, who'd give any defender a hard time - every forward can bully him, especially at set pieces.
Bottom line is that for the past 18 months, Skrtel hasn't been up to it. And we need Agger playing there, else we'll be defending from our 18 yard box and hoofing it.
Which leaves us with the choice of Agger & Carra (losing his pace, defends too deep), Agger & Kyrgiakos (less pace than Carra, whole-hearted but with the turning circle of a ferry) or Agger & Wilson (hasn't played much).
But what about another option: Agger & Kelly? Why wouldn't that work?