I dunno i reckon we are a little stacked. Van Ginkel, Mikel, Lampard, Ramires, Essien, De Bruyne (possibly) and throw De Rossi into the mix. That's quite a lot considering only 2 can play.
Van Ginkel's a versatile player, as are Essien, De Bruyne and Ramires. Of those lot, only Mikel, Lampard and De Rossi are specialist deep-lying midfielders, and even then it's not Lampard's best position. Theoretically, you could field nearly all of them in the same team - Mikel deep, De Rossi the link man, Lampard at the tip of a triangle, Van Ginkel wide left, Ramires wide right, Essien at right back and De Bruyne on the bench.
But my point is if you want to challenge on all fronts you need a deep squad, and getting rid of Mikel after all these years of his development is nonsensical. I'd definitely keep him considering you'll be trying to win every competition you're in.