San Diego Chargers running back Branden Oliver (43) celebrates his touchdown run during the NFL preseason game against the Dallas Cowboys on Thursday, Aug. 13, 2015 at Qualcomm Stadium in San Diego. (Ric Tapia/NFL)

San Diego Chargers running back Branden Oliver (43) during the NFL preseason game against the Dallas Cowboys on Thursday, Aug. 13, 2015 at Qualcomm Stadium in San Diego. (Ric Tapia/NFL)

San Diego Chargers quarterback Kellen Clemens (10) during the NFL preseason game against the Dallas Cowboys on Thursday, Aug. 13, 2015 at Qualcomm Stadium in San Diego. (Ric Tapia/NFL)

Dallas Cowboys defensive back Corey White (23) interferes with San Diego Chargers wide receiver Dontrelle Inman (15) during the NFL preseason game on Thursday, Aug. 13, 2015 at Qualcomm Stadium in San Diego. (Ric Tapia/NFL)

San Diego Chargers running back Danny Woodhead (39) scores on a touchdown run during the NFL preseason game against the Dallas Cowboys on Thursday, Aug. 13, 2015 at Qualcomm Stadium in San Diego. (Ric Tapia/NFL)

San Diego Chargers running back Melvin Gordon (28) during the NFL preseason game against the Dallas Cowboys and the San Diego Chargers on Thursday, Aug. 13, 2015 at Qualcomm Stadium in San Diego. (Ric Tapia/NFL)

San Diego Chargers running back Branden Oliver, left, breaks free from Dallas Cowboys defensive end Randy Gregory during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

Dallas Cowboys players huddle during the NFL preseason game against the San Diego Chargers on Thursday, Aug. 13, 2015 at Qualcomm Stadium in San Diego. (Ric Tapia/NFL)

Dallas Cowboys head coach Jason Garrett during the NFL preseason game against the San Diego Chargers on Thursday, Aug. 13, 2015 at Qualcomm Stadium in San Diego. (Ric Tapia/NFL)

Dallas Cowboys quarterback Dustin Vaughan (10) is sacked by San Diego Chargers linebacker Cordarro Law during the second half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

Dallas Cowboys quarterback Dustin Vaughan scrambles against the San Diego Chargers during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

Dallas Cowboys running back Gus Johnson (37) celebrates his touchdown against the San Diego Chargers during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

San Diego Chargers running back Danny Woodhead scores a touchdown as Dallas Cowboys strong safety Barry Church defends during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Denis Poroy)

San Diego Chargers running back Danny Woodhead celebrates after scoring a touchdown against the Dallas Cowboys during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Denis Poroy)

San Diego Chargers running back Melvin Gordon runs with the ball against the Dallas Cowboys during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

San Diego Chargers quarterback Philip Rivers throws a pass while playing the Dallas Cowboys during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

San Diego Chargers running back Danny Woodhead celebrates after scoring a touchdown against the Dallas Cowboys during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Denis Poroy)

Dallas Cowboys wide receiver Terrance Williams breaks free from San Diego Chargers inside linebacker Donald Butler during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Denis Poroy)

San Diego Chargers outside linebacker Melvin Ingram takes the field before playing the Dallas Cowboys in an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Gregory Bull)

Dallas Cowboys quarterback Jameill Showers scrambles against the San Diego Chargers during the second half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

San Diego Chargers running back Branden Oliver celebrates his touchdown against the Dallas Cowboys during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

San Diego Chargers rookie running back Melvin Gordon (28) tries to break free from Dallas Cowboys free safety J.J. Wilcox during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

Dallas Cowboys wide receiver Terrance Williams runs upfield after a completion as San Diego Chargers inside linebacker Donald Butler defends during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Denis Poroy)

San Diego Chargers running back Branden Oliver (43) breaks free of Dallas Cowboys linebacker Jasper Brinkley on his way to scoring a touchdown during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Denis Poroy)

Dallas Cowboys quarterback Dustin Vaughan looks to pass against the San Diego Chargers during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

San Diego Chargers running back Melvin Gordon (28) is hauled down by Dallas Cowboys defensive tackle Ken Bishop during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)

San Diego Chargers quarterback Kellen Clemens (10) fumbles the ball as he is hit by Dallas Cowboys defensive end Jack Crawford (58) during the first half of an NFL preseason football game Thursday, Aug. 13, 2015 in San Diego. (AP Photo/Lenny Ignelzi)