The 6-foot-6, 255-pound Miller rejoins the Colts after being waived by the team on July 29. He originally signed with Indianapolis as an undrafted free agent on May 3 before being placed on the team's non-football injury list on July 26.
Miller played in 27 games (20 starts) at Taylor University and finished his career with 80 receptions for 959 yards and seven touchdowns after transferring following two seasons at Santa Monica College in California.
The 6-2, 245-pound Igwenagu signed with the Colts as a free agent on July 19. He saw action in both of Indianapolis' preseason games. Igwenagu has played in three career NFL games (one start) and previously spent time with the Detroit Lions and Philadelphia Eagles.