Decker noted earlier this week that he'd be interested in a return to the Denver Broncos, with whom he played the first four years of his career. He was selected by the Broncos in the third round of the 2010 NFL Draft.
Decker has posted three 1,000-yard seasons during his career. The 6-foot-3, 214-pound Decker owns 439 career receptions for 5,816 yards and 53 touchdowns in eight seasons.
Crabtree had 89 receptions for 1,003 yards and eight touchdowns in 2016 for the Oakland Raiders, but those numbers dropped to 58 catches, 618 yards and eight scores in 2017.
Brown played in 10 games (five starts) for the Arizona Cardinals last season, when he had 21 catches for 299 yards and three scores.
Maclin gave Baltimore little bang for its buck after signing a two-year, $11 million deal last year. He had a career-low 40 receptions for 440 yards and scored three touchdowns in 2017.