The Cowboys will be playing at least the rest of this game and possibly more without the services of maybe the best guard in football. Zack Martin is now in concussion protocol.

Longtime backup Joe Looney replaced the All-Pro right guard in the lineup. Martin left the game in the second quarter. The fourth-year interior stalwart has never missed an NFL game.

This comes just as Tyron Smith returned to the lineup after a two-game absence.