Best Formation for current Chelsea Squad?

[Blue Armour 4,168]

I still feel we are lacking the player that can actually dominate the central midfield...Both in the attacking and in the defensive sense. Essien was good enough for both when he was in form and Makelele could dominate in the defensive sense. Now Lampard no longer has much influence and Mikel is woefully inconsistent. I feel we are going into the season relying heavily upon Essien to return to form, as well as expecting youngsters Van Ginkel and Oscar to step up. One might mention Ramires, but I feel he's more like an excellent supporting option in midfield. We really need to bring in another player to bolster the center.