That's kind of the problem.
Yesterday they sent Lars Anderson down
Yesterday they called up Iglesias (sent Tazawa down)
Today they are calling up Middlebrooks.
Today they are also calling up Mortnesen.
Cook is being called up to pitch Saturday
Youks is hurt, Beckett is hurt.
That's a lot of moves in one day. Someone is apt to speculate on 1 or 2 DLs in the age of twitter.
Now we know Youks is on the DL at least.
So it's Middlebrooks to the spot vacated by Anderson
Mortensen replaces Youk (it can easily be the other way around)
On Saturday (or maybe Friday depending on the requirements of Cook's opt out clause) Cook replaces either Mortensen (can he be sent down?) or maybe Iglesias and a corresponding 40 man move is made.