The workout was first reported by NFL Network. Ravens coach John Harbaugh would not comment on the reports when addressing reporters Monday.
"My only comment I have is we're not commenting on workouts," Harbaugh said after Monday's practice. "We're looking everywhere at everybody all the time. Whoever we bring in, once the workout happens, I'm sure that will be announced."
Bryant, 31, hasn't played in an NFL game since the end of the 2017 season, when he was released by the Cowboys in part because of an $18 million base salary and declining production.
Reigning NFL MVP Lamar Jackson is throwing to one of the youngest wide receiver groups in the NFL. No one is older than 27.
Baltimore's depth at wide receiver took a hit last week when backup Chris Moore broke his finger. He is expected to be out for a couple of weeks, Harbaugh said.
The Ravens had been connected to Bryant previously. In April 2018, Bryant turned down a multiyear offer from the Ravens because he wanted a bigger, one-year deal, according to ESPN's Ed Werder.
"It's up to the front office," Jackson said Tuesday when asked about the possibility of adding Bryant. "Dez is on Instagram running routes and he's looking pretty good on social media. If the front office likes him, we'll have to see what he gives you."
Baltimore's top three wide receivers are Marquise "Hollywood" Brown, Willie Snead IV and Miles Boykin. Ravens wideouts totaled 1,419 yards receiving last season, the fewest for that position since the 2011 Jacksonville Jaguars.
After signing a five-year, $70 million deal in 2015, Bryant was slowed by injuries that kept him out of a combined 10 games in 2015 and 2016. He caught 69 passes for 838 yards and six touchdowns in 16 games in 2017.
He had been working out at a facility close to the Cowboys' headquarters in Frisco, Texas, as he attempts to return after two years away from game action because of a torn Achilles. Bryant suffered the injury in his first practice with the New Orleans Saints in 2018. He was not on a roster in 2019 but has been working out regularly for a comeback.
The Cowboys selected Bryant in the first round in 2010, and he is the franchise's career leader in touchdown receptions with 73. He caught 531 passes for 7,459 yards and was a three-time Pro Bowl pick in eight seasons with the team.
ESPN's Todd Archer and Jamison Hensley contributed to this report.