Gregory tested positive for COVID-19, and Lawrence underwent foot surgery this week.
On Saturday, the Cowboys announced that starting strong safety Donovan Wilson was not making the trip to Los Angeles. They downgraded Wilson to out with a groin injury.
“He is a lot more comfortable,” Cowboys coach Mike McCarthy said of Hooker on Friday. “Training camp and getting through that, we just didn’t want to go too fast with him coming off the injury and the rehab he was going through. I thought he looked good in practice.”
The Cowboys also announced they activated tight end Jeremy Sprinkle from the practice squad as a COVID-19 replacement for Gregory.