The four will begin practicing and the Cowboys have 21 days to activate them to the roster.
Vander Esch worked on a side field as he heals from a broken collarbone. Brown had a rib injury, while Bryant and Erving are each coming off knee injuries.
Vander Esch, 24, is a former first-round pick of the Cowboys back in 2018. He’s currently in the third year of his four-year, $11.8 million contract that included a $6.7 million signing bonus.
The Cowboys will have a fifth-year option to pick up on Vander Esch for the 2022 season.
In 2019, Vander Esch appeared in nine games for the Cowboys and recorded 72 tackles, a half sack, a forced fumble and three pass defenses.