OXNARD, Calif. – The Cowboys will begin to do some light work for the Aug. 13 preseason opener at Oakland later in the week, but they are already preparing to go into the game without a number of injured players.

The Cowboys have an injury report list that is 18 players long and includes starters and regulars, like Miles Austin (hamstring), Jay Ratliff (foot), Morris Claiborne (knee) and Anthony Spencer (hamstring).

Garrett would not get specific on who will sit but said, “a large, large majority of the guys will not play against Oakland, but there are some guys we’ll hold or get some work at the end of the week and get a chance to play in the games.”

“All of these guys are kind of day-to-day,” Garrett said. “We don’t think anybody is incredibly serious. We just want to kind of manage them and what we try to do is target; ‘Hey, we’re thinking about Oakland, definitely San Diego. We’re thinking about San Diego, definitely St. Louis.’ And we go through that list three times a day and just see how they’ve done.”

Guard Mackenzy Bernadeau, who will run the conditioning test today, wide receiver Danny Coale and safety Matt Johnson have been cleared from the physically unable to perform list but will not play. Garret said guards Daniel Loper and Derrick Dockery, who signed Friday, will get action against the Raiders.