Lamb is in the NFL's COVID-19 protocols, Todd Archer of ESPN.com reports.

Also headed for the reserve/COVID-19 list are teammates Carlos Watkins, Malik Hooker and Israel Mukuamu. Per David Moore of The Dallas Morning News, the players won't be eligible to practice until they clear league protocols but should do so before Week 1. The Cowboys open their regular-season slate Sept. 9 against the Buccaneers.