Dallas Cowboys running back Ezekiel Elliott (21) looks on from the sideline alongside quarterback Dak Prescott, left, during the first half of a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Mark J. Terrill)

Newly-acquired Los Angeles Rams wide receiver Sammy Watkins looks on before a preseason NFL football game against Dallas Cowboys, Saturday, Aug. 12, 2017, in Los Angeles. Watkins was acquired from the Buffalo Bills. (AP Photo/Mark J. Terrill)

Dallas Cowboys running back Ezekiel Elliott runs a drill before a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Mark J. Terrill)

The Los Angeles Rams take the field before facing the Dallas Cowboys in a preseason NFL football game Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Mark J. Terrill)

Los Angeles Rams wide receiver Cooper Kupp (18) celebrates with teammate wide receiver Robert Woods, right, after scoring off a fumble recovery during the first half of a preseason NFL football game against the Dallas Cowboys, Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Mark J. Terrill)

Los Angeles Rams wide receiver Cooper Kupp scores a touchdown on a fumble-recovery during the first half of a preseason NFL football game against the Dallas Cowboys, Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Jae C. Hong)

Dallas Cowboys quarterback Kellen Moore throws a pass during the first half of a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Mark J. Terrill)

Dallas Cowboys defensive end Taco Charlton, right, gets a hand to the mask from the Los Angeles Rams offensive guard Cody Wichmann during the first half of a preseason NFL football game Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Mark J. Terrill)

Dallas Cowboys defensive end Taco Charlton, right, gets past Los Angeles Rams offensive tackle Pace Murphy, center, during the first half of a preseason NFL football game Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Mark J. Terrill)

Dallas Cowboys defensive end Taco Charlton sacks Los Angeles Rams quarterback Sean Mannion during the first half of a preseason NFL football game Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Jae C. Hong)

Dallas Cowboys running back Darren McFadden (10) takes a handoff from quarterback Kellen Moore during the first half of a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Jae C. Hong)

Dallas Cowboys wide receiver Uzoma Nwachukwu leaps over Los Angeles Rams defensive back Marqui Christian as he makes a catch during the second half of a preseason NFL football game Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Mark J. Terrill)

Dallas Cowboys running back Ezekiel Elliott looks on from the sideline during the second half of a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Jae C. Hong)

Dallas Cowboys tight end Rico Gathers (80) scores a touchdown during the second half of a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Jae C. Hong)

Newly acquired Los Angeles Rams wide receiver Sammy Watkins watches from the sideline during the second half of the team's preseason NFL football game against the Dallas Cowboys on Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Mark J. Terrill)

Dallas Cowboys tight end Rico Gathers, center, celebrates his touchdown with teammates wide receiver Uzoma Nwachukwu, right, and tight end Blake Jarwin (89) during the second half of a preseason NFL football game against the Los Angeles Rams against the Los Angeles Rams, Saturday, Aug. 12, 2017, in Los Angeles. (AP Photo/Mark J. Terrill)

Los Angeles Rams middle linebacker Alec Ogletree #52 and Los Angeles Rams outside linebacker Josh Forrest #59 celebrate during an NFL preseason football game against the Dallas Cowboys on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Los Angeles Rams wide receiver Paul McRoberts #19 hugs Dallas Cowboys running back Ezekiel Elliott #21 during an NFL preseason football game on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Line of scrimmage during an NFL preseason football game against the Dallas Cowboys and the Los Angeles Rams on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Dallas Cowboys quarterback Luke McCown #3 runs during an NFL preseason football game against the Dallas Cowboys and the Los Angeles Rams on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Los Angeles Rams coach Sean McVay, right, greets Dallas Cowboys coach Jason Garrett after a preseason NFL football game Saturday, Aug. 12, 2017, in Los Angeles. The Rams won 13-10. (AP Photo/Jae C. Hong)

Dallas Cowboys wide receiver Dez Bryant #88 warms up before an NFL preseason football game against the Los Angeles Rams on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Los Angeles Rams middle linebacker Alec Ogletree #52 in the pregame huddle before an NFL preseason football game against the Dallas Cowboys on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Dallas Cowboys wide receiver Dez Bryant #88 and Dallas Cowboys quarterback Dak Prescott #4 walk off during an NFL preseason football game against the Los Angeles Rams on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Dallas Cowboys tight end Blake Jarwin (89) hauls in a pass as Los Angeles Rams linebacker Kevin Davis watches during the second half of a preseason NFL football game Saturday, Aug. 12, 2017, in Los Angeles. The Rams won 13-10. (AP Photo/Mark J. Terrill)

Dallas Cowboys quarterback Luke McCown (3) misses the snap during the second half of the team's preseason NFL football game against the Los Angeles Rams Saturday, Aug. 12, 2017, in Los Angeles. The ball was recovered by the Rams, who won 13-10. (AP Photo/Mark J. Terrill)

Dallas Cowboys defensive end Lenny Jones #56 and Dallas Cowboys safety Xavier Woods #25 celebrate a defensive play during an NFL preseason football game against the Los Angeles Rams on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Dallas Cowboys tight end Rico Gathers #80 scores a touchdown during an NFL preseason football game against the Los Angeles Rams on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Dallas Cowboys tight end Rico Gathers #80 runs during an NFL preseason football game against the Los Angeles Rams on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Dallas Cowboys wide receiver Noah Brown #85 makes a catch during an NFL preseason football game against the Los Angeles Rams on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Dallas Cowboys quarterback Dak Prescott #4 before an NFL preseason football game against the Los Angeles Rams on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)

Dallas Cowboys running back Ezekiel Elliott #21 before an NFL preseason football game against the Los Angeles Rams on Saturday, Aug. 12, 2017 in Los Angeles. (Ric Tapia/NFL)