Dallas Cowboys quarterback Dak Prescott (4) greets teammate running back Ezekiel Elliott (21) at the beginning of an NFL football training camp practice in Frisco, Texas, Friday, Aug. 14, 2020. (AP Photo/LM Otero)

Dallas Cowboys head coach Mike McCarthy watches during an NFL football training camp practice in Frisco, Texas, Friday, Aug. 14, 2020.(AP Photo/LM Otero)

Dallas Cowboys offensive linemen Joe Looney (73), Connor Williams (52), Zach Martin (70), Tyrone Smith (77), Terence Steele (74) and others walk the field after a drill during an NFL football training camp in Frisco, Texas, Friday, Aug. 14, 2020. (AP Photo/LM Otero)

Dallas Cowboys head coach Mike McCarthy, right, and offensive line coach Joe Philbin watch team practice during an NFL football training camp in Frisco, Texas, Friday, Aug. 14, 2020. (AP Photo/LM Otero)

Dallas Cowboys quarterback Dak Prescott (4) talks with teammate Clayton Thorson (5) during an NFL football training camp practice in Frisco, Texas, Friday, Aug. 14, 2020. (AP Photo/LM Otero)

Dallas Cowboys wide receiver CeeDee Lamb (88) reaches for a pass during NFL football training camp in Frisco, Texas, Friday, Aug. 14, 2020. (AP Photo/LM Otero)

The Dallas Cowboys practice at NFL football training camp in Frisco, Texas, Friday, Aug. 14, 2020. (AP Photo/LM Otero)