Lamb is not participating in the early portion of Wednesday's practice open to the media, Nick Harris of the Fort Worth Star-Telegram reports.

EDGE Analysis

Lamb cleared the NFL's concussion protocol in time to suit up for Dallas' loss to the Vikings in Week 15, in which he tallied his third consecutive 100-yard performance. Now, it remains to be seen whether the star wide receiver is dealing with another injury or simply receiving a day of rest. Lamb and the Cowboys' passing game are staring down a difficult home matchup against the Chargers' defense on Sunday.