He was scheduled to take on Jake Ellenberger at UFC 151 before his injury and Ellenberger recently defeated Jay Hieron by unanimous decision at UFC on FX 5.
A fight with Demian Maia is unlikely, as Maia may end up facing Jon Fitch since both fighters are coming off impressive victories at UFC 153. Rory MacDonald is already scheduled to face BJ Penn at UFC on FOX 5 and Koscheck would have to wait longer to get a shot at the Canadian fighter.
The fight with Nick Diaz may make the most sense with both fighters coming off a lost and Diaz will return from suspension from the Nevada State Athletic Commission in February. Both fighters are known for their ability to trash talk their opponent and sell a fight, which makes this the most likely opponent for Koscheck in his next fight.