Grant was drafted in the fifth round of the 2014 NFL Draft by the Redskins out of Tulane University.
The Ravens missed on most of the top available wide receivers before signing Brown.
The 27-year-old Brown also has the Sickle Cell Trait, which puts a constant question mark on his health.
Given the size of the contracts that several other free-agent receivers reportedly agreed to Tuesday, the deal for Brown is low-risk, high-reward.
Brown, a third-round pick out of Pittsburg State in 2014, also missed six games with a toe injury a year ago.
Still, Brown could inject some life into the Ravens' air attack that ranked just 29 last season with an average of 189.4 passing yards per game. He played in only 10 games in 2017 due to toe and quad ailments, while the Cardinals' offense suffered greatly from the injuries of running back David Johnson and quarterback Carson Palmer.
Brown has spent the first four years of his career with the Arizona Cardinals.
Even with the expected additions of Brown and Grant, the Ravens might not be done at receiver. They could pursue former Green Bay Packers standout Jordy Nelson, who was released Tuesday. Previously, his best season had been 2015 when he ended the year with 268 yards on 23 catches and two touchdowns.
However, he is just two years removed from topping 1,000 receiving yards.
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