Eagles coach Andy Reid described DeSean Jackson's injury late Monday as a "rib cartilage" ailment.
Jackson left late in the first quarter with what initially had the look of a potential collarbone injury. Regardless of the injured area, the fact that Jackson left so early in the game and never returned suggests it could be serious. The Eagles play the Cowboys in Week 13. Should Jackson not be ready to play, Jeremy Maclin would be the No. 1 and Jason Avant -- assuming his hamstring is healed -- would replace D-Jax at Z receiver.