W2W4: Cowboys training camp: Day 13

OXNARD, Calif. -- The Cowboys have their final practice of the week before traveling to Oakland to face the Raiders on Friday night.

Here's what to expect:

It's a full-contact practice: In recent days we've heard about the Pittsburgh Steelers having a full-scale tackle practice in training camp. The Cowboys aren't having that, however, they will go in full pads again on Wednesday. While the players are not allowed to tackle, sometimes a few hard hits bring players to the ground. Tuesday was a good example, with the players taking a few clean shots, resulting in a few bodies hitting the deck.

More roster changes?: The Cowboys have concerns about the offensive line and there's a chance the team could sign veteran guard Brandon Moore, who played for the New York Jets last season. As it stands, the Cowboys have five offensive linemen hurt, so filling a interior line spot could be beneficial. If the team signs anyone, that person can practice Wednesday, but its doubtful if he'll play in Friday night's game at Oakland.

Game prep for Oakland: Coach Jason Garrett said he will game plan for the Oakland game on Tuesday. Now this is the Raiders' first preseason game, so the only current looks the Cowboys' coaches have is from last season. Expect the Cowboys to run some game-like situations for their players, particularly the veterans who will play in the game like Tony Romo and DeMarcus Ware, among others.

No Terrance Williams again?: Every player from the 2013 draft class participated in the preseason opener with the exception of wide receiver Terrance Williams. He suffered a concussion two days before the first preseason game and must past the concussion guideline tests in order to play again. He's doubtful for the Raiders game and most likely will make his debut Aug. 17 at Arizona. Oft-injured safety Matt Johnson (foot) is also doubtful for the game with his injury. He had limited snaps against the Dolphins.