The Colts placed Dulin (foot) on injured reserve Tuesday.
Dulin made an early departure from the Colts' eventual overtime win at Denver last Thursday. His foot injury is serious enough to sideline the fourth-year pro for at least the next four games, meaning he isn't eligible to return to the active roster until Sunday, Nov. 13 against Las Vegas at the earliest. Dulin wasn't seeing much usage, but Parris Campbell and Mike Strachan could see a handful of additional reps as reserve wide receivers behind Michael Pittman and Alec Pierce.