The Cowboys placed Dalton (concussion) on the reserve/COVID-19 list Tuesday, meaning he'll miss Sunday's game versus the Steelers, Todd Archer of ESPN.com reports.
Regardless of Dalton's progress through the NFL's five-step concussion protocol, he won't be able to clear the league's COVID-19 protocols by Sunday. This means Ben DiNucci will likely start a second straight game under center while Garrett Gilbert serves as the backup quarterback. The Cowboys have a Week 10 bye, so Dalton will aim to return Week 11 against the Vikings.