Donovan can fill in the striker role and an attacking midfield role.
A centre midfield player could be nice, probably someone who can play a deeper role and keep things steady.
We really need defenders and quickly! At least 2 including one who can cover at left back. I doubt we'll see the best of Jagielka this season and Yobo will be gone for a few weeks anyway.
So we really need at least 3 more players in January, preferably some who aren't injury prone.