It is not immediately known if the Saints (7-1) are planning to sign one of the wideouts or have them work out for the team should the need arise down the road.
Pro Bowl wideout Michael Thomas has flourished this season, recording 70 receptions for 880 yards and five touchdowns. The 25-year-old finished with 12 catches, a franchise-best 211 yards and a touchdown in New Orleans' 45-35 win over the Los Angeles Rams on Sunday.
The 30-year-old Bryant had a team-leading 69 receptions for 838 yards and six touchdowns with Dallas in 2017. He has gone a career-long 23 regular-season games without a 100-yard performance.
Marshall, 34, was released by the Seattle Seahawks last month after recording 11 receptions for 136 yards -- with nine catches for 120 yards coming in his first three games. He recently worked out with the Detroit Lions, per ESPN's Field Yates.
Aiken, 29, had six receptions for 53 yards in five games with the Philadelphia Eagles this season. He has 149 catches for 1,725 yards and nine touchdowns in 68 career contests with the Indianapolis Colts, Baltimore Ravens and Eagles.