Marshall is slated to work out for the Colts on Friday, Adam Schefter of ESPN reports.
Marshall was released by the Saints on Wednesday, Field Yates of ESPN reports.
Marshall (coach's decision) is inactive for Sunday's Week 14 tilt against the Buccaneers.
Marshall (coach's decision) is listed as inactive Thursday against the Falcons.
Marshall recently went through a workout with the Lions, Adam Caplan of SiriusXM Radio reports.
Marshall played just seven snaps in Sunday's 33-31 loss to the Rams, finishing without a catch on one target.
Marshall caught one of three targets for five yards in Sunday's 20-17 win over the Cardinals.
Marshall hauled in two of six targets for 30 yards in Sunday's 24-13 win over the Cowboys.
Marshall caught four passes on six targets for 44 yards during Monday's 24-17 loss to the Bears.
Marshall could take on an expanded role with Doug Baldwin (knee) in danger of missing multiple games, ESPN.com's Brady Henderson reports.