Brown's 2019 season with the Cowboys was cut short because of a torn triceps. In nine games, he was credited with 17 tackles and 5 pass deflections before suffering the injury.
He can play in the slot and outside, and his return can help mitigate the loss of free agent Byron Jones to the Miami Dolphins, but it won't prevent the Cowboys from looking for corner help in the draft.
A sixth-round pick in 2016, Brown, 26, quickly earned a role as a No. 3 corner as a rookie, starting nine games and intercepting a pass.
In 2017 and '18, he started 10 games apiece and had three interceptions.
The Cowboys also shored up their offensive line Wednesday, keeping center/guard Joe Looney on a one-year deal, sources told ESPN.
Looney has started 20 games in his four seasons with the Cowboys including all 16 in 2018 when he took over for Travis Frederick. Looney can play multiple spots on the offensive line, which is a plus, and showed two years ago he can be a full-time player.