Dallas Cowboys quarterback Cooper Rush (7) throws a pass as Houston Texans linebacker Peter Kalambayi (58) defends in the first half of a preseason NFL football game in Arlington, Texas, Saturday, Aug. 24, 2019. (AP Photo/Michael Ainsworth)

Dallas Cowboys head coach Jason Garrett, left, greets quarterback Cooper Rush as he comes off the field during the second half of a preseason NFL football game against the Los Angeles Rams Saturday, Aug. 17, 2019, in Honolulu. (AP Photo/Mark J. Terrill)

Dallas Cowboys' Cooper Rush warms up before a preseason NFL football game against the Tampa Bay Buccaneers in Arlington, Texas, Thursday, Aug. 29, 2019. (AP Photo/Ron Jenkins)

Dallas Cowboys quarterback Cooper Rush (7) throws during the first half of a preseason NFL football game against the Arizona Cardinals in Arlington, Texas, Sunday, Aug. 26, 2018. (AP Photo/Michael Ainsworth)

Dallas Cowboys head coach Jason Garrett, right, talks with quarterback Cooper Rush (7) during the first half of a preseason NFL football game against the Arizona Cardinals in Arlington, Texas, Sunday, Aug. 26, 2018. (AP Photo/Ron Jenkins)

Dallas Cowboys quarterback Cooper Rush (7) shakes hands with head coach Jason Garrett 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 quarterback Cooper Rush (7) walks to the field prior to an NFL football game against the New Orleans Saints, Sunday, Sept. 29, 2019, in New Orleans. New Orleans won 12-10. (Aaron M. Sprecher via AP)

Dallas Cowboys quarterback Cooper Rush (7) rolls out to pass during a 2019 NFL week 3 preseason game against the Houston Texans, Saturday, August 24, 2019, in Arlington, Texas. The Cowboys defeated the Texans, 34-0. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes the football in pre game warm ups during an NFL football game against the Chicago Bears, Thursday, Dec. 5, 2019 in Chicago. The Bears defeated the Cowboys 31-24. (Scott Boehm via AP)

Dallas Cowboys quarterback Cooper Rush (7) warms up before an NFL football game against the Buffalo Bills in Arlington, Texas, Thursday, Nov. 28, 2019. The Bills beat the Cowboys 26-15. (Cooper Neill via AP)

Dallas Cowboys quarterback Cooper Rush (7) in action prior to an NFL football game Sunday, Dec. 22, 2019, in Philadelphia. The Eagles won 17-9. (AP Photo/Chris Szagola)

Dallas Cowboys quarterback Cooper Rush (7) warms up before an NFL football game against the Buffalo Bills in Arlington, Texas, Thursday, Nov. 28, 2019. The Bills beat the Cowboys 26-15. (Cooper Neill via AP)

Dallas Cowboys quarterback Cooper Rush (7) drops back to pass in the first half of a preseason NFL football game against the Houston Texans in Arlington, Texas, Saturday, Aug. 24, 2019. (AP Photo/Michael Ainsworth)

Dallas Cowboys quarterback Cooper Rush warms up prior to an NFL football game between the Dallas Cowboys and Washington Redskins, Sunday, Sept. 15, 2019, in Landover, Md. (AP Photo/Mark Tenally)

Dallas Cowboys quarterback Cooper Rush (7) warms up before an NFL football game against the Philadelphia Eagles, Sunday, Oct. 20, 2019, in Arlington, Texas. The Cowboys beat the Eagles 37-10. (Cooper Neill via AP)

Dallas Cowboys quarterback Cooper Rush (7) in the first half during an NFL football game against the Philadelphia Eagles, Sunday, Oct. 20, 2019, in Arlington, Texas. (Rick Scuteri via AP)

Dallas Cowboys quarterback Cooper Rush (7) tosses a pass during pregame of an NFL football game against the Detroit Lions, Sunday, Nov. 17, 2019, in Detroit. (AP Photo/Duane Burleson)

Dallas Cowboys quarterback Cooper Rush (7) warms up before an NFL football game against the Green Bay Packers, Sunday, Oct. 6, 2019, in Arlington, Texas. The Packers beat the Cowboys 34-24. (Cooper Neill via AP)

Dallas Cowboys quarterback Cooper Rush throws before an NFL football game in Detroit, Sunday, Nov. 17, 2019. (AP Photo/Paul Sancya)

Dallas Cowboys quarterback Cooper Rush (7) in the first half during an NFL football game against the Philadelphia Eagles, Sunday, Oct. 20, 2019, in Arlington, Texas. (Rick Scuteri via AP)

Dallas Cowboys quarterback Cooper Rush warms up prior to an NFL football game between the Dallas Cowboys and Washington Redskins, Sunday, Sept. 15, 2019, in Landover, Md. (AP Photo/Mark Tenally)

Dallas Cowboys quarterback Cooper Rush (7) passes the football in pre game warm ups during an NFL football game against the Chicago Bears, Thursday, Dec. 5, 2019 in Chicago. The Bears defeated the Cowboys 31-24. (Scott Boehm via AP)

Dallas Cowboys quarterback Cooper Rush (7) throws before an NFL football game against the New York Giants, Sunday, Sept. 8, 2019, in Arlington, Texas. The Cowboys defeated the Giants, 35-17. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes before an NFL football game against the New York Giants, Sunday, Sept. 8, 2019, in Arlington, Texas. The Cowboys defeated the Giants, 35-17. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) throws a pass during pregame warmups before an NFL football preseason game against the Tampa Bay Buccaneers, Thursday, Aug. 29, 2019 in Arlington, Tex. The Buccaneers defeated the Cowboys 17-15. (Paul Spinelli via AP)

Dallas Cowboys quarterback Cooper Rush (7) rolls out to pass during a NFL football game against the Houston Texans, Saturday, Aug. 24, 2019 in Arlington, Tex. The Cowboys won the game 34-0. (Paul Jasienski via AP)

Dallas Cowboys quarterback Cooper Rush (7) looks downfield for a receiver in an NFL preseason game against the Houston Texans, Saturday, Aug. 25, 2019 in Arlington, Texas. The Cowboys defeated the Texans 34-0 (Margaret Bowles via AP)

Houston Texans defensive end Charles Omenihu (94) rushes as Dallas Cowboys' Cooper Rush (7) throws a pass in the first half of a preseason NFL football game in Arlington, Texas, Saturday, Aug. 24, 2019. (AP Photo/Michael Ainsworth)

Dallas Cowboys quarterback Cooper Rush looks to pass during the first half of a preseason NFL football game against the Houston Texans in Arlington, Texas, Saturday, Aug. 24, 2019. (AP Photo/Roger Steinman)

Dallas Cowboys quarterback Cooper Rush (7) looks downfield for a receiver in an NFL preseason game against the Houston Texans, Saturday, Aug. 25, 2019 in Arlington, Texas. The Cowboys defeated the Texans 34-0 (Margaret Bowles via AP)

Dallas Cowboys tight end Jason Witten (82) talks with quarterback Cooper Rush (7) during a 2019 NFL week 3 preseason game against the Houston Texans, Saturday, August 24, 2019, in Arlington, Texas. The Cowboys defeated the Texans, 34-0. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football training camp Monday, August 26, 2019 in Frisco, Texas. (James D Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during a 2019 NFL week 3 preseason game against the Houston Texans, Saturday, August 24, 2019, in Arlington, Texas. The Cowboys defeated the Texans, 34-0. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) is seen in action during the second half of a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 17, 2019, in Honolulu. (AP Photo/Marco Garcia)

Dallas Cowboys quarterback Cooper Rush (7) walks onto the field during an NFL preseason football game against the Los Angeles Rams on Saturday, Aug. 17, 2019 in Honolulu. Dallas won 14-10. (Aaron M. Sprecher via AP)

Houston Texans defensive end Charles Omenihu (94) rushes as Dallas Cowboys quarterback Cooper Rush (7) throws a pass in the first half of a preseason NFL football game in Arlington, Texas, Saturday, Aug. 24, 2019. (AP Photo/Michael Ainsworth)

The Dallas Cowboys huddle up on offense during an NFL preseason football game against the Los Angeles Rams on Saturday, Aug. 17, 2019 in Honolulu. Dallas won 14-10. (Aaron M. Sprecher via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during a 2019 NFL week 2 preseason game against the Los Angeles Rams, Saturday, August 17, 2019 in Honolulu. The Cowboys defeated the Rams, 14-10. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football training camp Thursday, August 22, 2019 in Frisco, Texas. (James D Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football training camp Tuesday, August 20, 2019 in Frisco, Texas. (James D Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) is seen in action during the second half of a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 17, 2019, in Honolulu. (AP Photo/Marco Garcia)

Dallas Cowboys quarterback Cooper Rush (7) is seen in action during the second half of a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 17, 2019, in Honolulu. (AP Photo/Marco Garcia)

Dallas Cowboys quarterback Cooper Rush gets set to pass during the second half of a preseason NFL football game against the Los Angeles Rams Saturday, Aug. 17, 2019, in Honolulu. (AP Photo/Mark J. Terrill)

Dallas Cowboys head coach Jason Garrett, left, greets quarterback Cooper Rush as he comes off the field during the second half of a preseason NFL football game against the Los Angeles Rams Saturday, Aug. 17, 2019, in Honolulu. (AP Photo/Mark J. Terrill)

Dallas Cowboys quarterback Cooper Rush (7) scrambles up the middle during a 2019 NFL week 2 preseason game against the Los Angeles Rams, Saturday, August 17, 2019 in Honolulu. The Cowboys defeated the Rams, 14-10. (James D. Smith via AP)

IMAGE WAS SHOT IN MONOCHROME AND NOT EDITED. Dallas Cowboys quarterbacks Cooper Rush (7), Dak Prescott (4) and Mike White (3) huddle in the tunnel before an NFL preseason game against the San Francisco 49ers on Saturday, Aug. 10, 2019, in Santa Clara, Calif. The 49ers defeated the Cowboys 17-9. (Kevin Terrell via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football training camp Thursday, August 15, 2019 in Oxnard, Calif. (James D Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) sets up to pass during an NFL preseason game against the San Francisco 49ers on Saturday, Aug. 10, 2019, in Santa Clara, Calif. The 49ers defeated the Cowboys 17-9. (Kevin Terrell via AP)

Dallas Cowboys quarterback Cooper Rush (7) runs during an NFL football training camp Wednesday, August 14, 2019 in Oxnard, Calif. (James D Smith via AP)

Dallas Cowboys center Joe Looney (73) gets set to snap the ball to a pointing Dallas Cowboys quarterback Cooper Rush (7) during an NFL football training camp, Sunday, July 28, 2019 in Oxnard, Calif. (Paul Spinelli via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football training camp Monday, August 12, 2019 in Oxnard, Calif. (James D Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football training camp Monday, August 12, 2019 in Oxnard, Calif. (James D Smith via AP)

Dallas Cowboys quarterbacks coach Jon Kitna (right) slaps at the ball held by quarterback Cooper Rush (7) in a drill during an NFL football training camp Monday, August 12, 2019 in Oxnard, Calif. (James D Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) drops back to pass during an NFL football training camp, Sunday, July 28, 2019 in Oxnard, Calif. (Paul Spinelli via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football game against the San Francisco 49ers, Saturday, Aug. 10, 2019 in Santa Clara, Calif. The 49ers defeated the Cowboys 17-9. (Greg Trott via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football game against the San Francisco 49ers, Saturday, Aug. 10, 2019 in Santa Clara, Calif. The 49ers defeated the Cowboys 17-9. (Greg Trott via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during a 2019 NFL week 1 preseason game against the San Francisco 49ers, Saturday, August 10, 2019 in Santa Clara, Calif. The 49ers defeated the Cowboys, 17-9. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) looks for a receiver during a 2019 NFL week 1 preseason game against the San Francisco 49ers, Saturday, August 10, 2019 in Santa Clara, Calif. The 49ers defeated the Cowboys, 17-9. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football game against the San Francisco 49ers, Saturday, Aug. 10, 2019 in Santa Clara, Calif. The 49ers defeated the Cowboys 17-9. (Greg Trott via AP)

Dallas Cowboys quarterback Cooper Rush (7) passes during a 2019 NFL week 1 preseason game against the San Francisco 49ers, Saturday, August 10, 2019 in Santa Clara, Calif. The 49ers defeated the Cowboys, 17-9. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) drops back against the San Francisco 49ers during the first half of an NFL preseason football game in Santa Clara, Calif., Saturday, Aug. 10, 2019. (AP Photo/Josie Lepe)

Dallas Cowboys quarterback Cooper Rush (7) at training camp on Saturday, July 27, 2019 in Oxnard, Calif. (Caitlyn Epes via AP)

Dallas Cowboys quarterback Cooper Rush (7) throws a pass against the San Francisco 49ers during the first half of an NFL preseason football game in Santa Clara, Calif., Saturday, Aug. 10, 2019. (AP Photo/John Hefti)

Dallas Cowboys quarterbacks Cooper Rush (7), Mike White (3), Dak Prescott (4) and Taryn Christion, right, gather at the NFL football team's training camp in Oxnard, Calif., Saturday, July 27, 2019. (AP Photo/Michael Owen Baker)

Dallas Cowboys quarterbacks coach Jon Kitna talks with quarterbacks Cooper Rush (7), Dak Prescott (4) and Mike White (3) during NFL football practice in Frisco, Texas, Wednesday, May. 22, 2019. (AP Photo/Michael Ainsworth)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football training camp Saturday, July 27, 2019 in Oxnard, Calif. (James D Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) prepares to throw a pass as he participates in drills at the team's NFL football training facility in Frisco, Texas, Thursday, June 13, 2019. (AP Photo/Tony Gutierrez)

Dallas Cowboys quarterbacks Cooper Rush (7) and Dak Prescott (4) throw passes during NFL football practice in Frisco, Texas, Wednesday, May. 22, 2019. (AP Photo/Michael Ainsworth)

Dallas Cowboys quarterback Cooper Rush (7) passes during an NFL football organized team activity session at the team's training facility Wednesday, June 5, 2019, in Frisco, Texas. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) throws against the Houston Texans during the first half of a preseason NFL football game Thursday, Aug. 30, 2018, in Houston. (AP Photo/George Bridges)

Dallas Cowboys quarterback Cooper Rush (7) throws a pass during NFL football practice in Frisco, Texas, Wednesday, May. 22, 2019. (AP Photo/Michael Ainsworth)

Dallas Cowboys quarterback Cooper Rush (7) throws against the Houston Texans during the first half of a preseason NFL football game Thursday, Aug. 30, 2018, in Houston. (AP Photo/Eric Christian Smith)

Dallas Cowboys quarterback Cooper Rush (7) rolls out during an NFL training camp practice Saturday, July 28, 2018 at City of Oxnard Fields in Oxnard, California. (James D. Smith via AP)

Dallas Cowboys quarterback Cooper Rush (7) prepares to pass during an NFL preseason football game against the San Francisco 49ers on Thursday, Aug. 9, 2018 in Santa Clara, Calif. (Ben Liebenberg via AP)

Dallas Cowboys quarterback Cooper Rush throws a pass during the first half of the team's preseason NFL football game against the Arizona Cardinals in Arlington, Texas, Sunday, Aug. 26, 2018. (AP Photo/Ron Jenkins)

Dallas Cowboys quarterback Cooper Rush (7) throws during the first half of a preseason NFL football game against the Arizona Cardinals in Arlington, Texas, Sunday, Aug. 26, 2018. (AP Photo/Michael Ainsworth)

Dallas Cowboys quarterback Cooper Rush (7) warms up before an preseason NFL football game against the Arizona Cardinals in Arlington, Texas, Sunday, Aug. 26, 2018. (AP Photo/Ron Jenkins)

Dallas Cowboys quarterback Cooper Rush (7) throws before an preseason NFL Football game against the Cincinnati Bengals in Arlington, Texas, Saturday, Aug. 18, 2018. (AP Photo/Michael Ainsworth)

Dallas Cowboys head coach Jason Garrett looks on as he stands with Dallas Cowboys rookie quarterback Cooper Rush (7) near the sideline during the 2017 NFL Pro Football Hall of Fame preseason football game against the Arizona Cardinals on Thursday, Aug. 3, 2017 in Canton, Ohio. The Cowboys won the game 20-18. (Paul Spinelli via AP)