Davis, 27, worked out for the organization to begin the week and was spotted wearing No. 30 at practice.
The Maryland product entered the league in the second round of the 2016 draft with the Pittsburgh Steelers. He has appeared in 73 games and made 47 starts since then, including postseason, to tally 287 tackles, 3.5 sacks, one forced fumble, two fumble recoveries and five interceptions.
Davis reconvened with the Steelers in 2020 after spending the offseason with the Washington Football Team. And previously this fall, the 6-foot-1, 202-pound defensive back made stops on the practice squads of the Indianapolis Colts and Cincinnati Bengals. He served as an elevation for both clubs, seeing 13 snaps on defense and 19 snaps on special teams over four contests.
At the 2016 NFL Scouting Combine, Davis ran the 40-yard dash in 4.46 seconds, the three-cone drill in 6.64 seconds and the short shuttle in 3.97 seconds. He also leaped for a 37.5-inch vertical and 126-inch broad jump.
The Patriots stood with a practice squad of 16 prior to the addition.
The Dallas Cowboys visit for a 4:25 p.m. ET kickoff Sunday at Gillette Stadium.