Rey Mysterio is presently working through a rotator cuff injury. The injury occurred during SmackDown!'s most recent overseas tour and company officials have been limiting his in-ring work at television and pay-per-view events, as well as house shows. He's contained in tag matches when he does work non-televised events.
Meanwhile, Mysterio handpicked Cody Rhodes to work his current storyline with. Current plans call for the two to face off at WrestleMania XXVII. Of course, that could change.
Mysterio is said to be hopeful that he can avoid surgery through rehabilitation.