Pacheco (elbow) signed a minor-league contract with the Tigers last week, Evan Petzold of the Detroit Free Press reports.
Pacheco (elbow) was designated for assignment by the Tigers on Tuesday.
Pacheco underwent Tommy John surgery, Baseball America reports.
Pacheco reported right elbow soreness following a bullpen session Friday, Evan Petzold of the Detroit Free Press reports.
Pacheco was able to throw his first bullpen session Friday, and is scheduled to throw another next week.
Pacheco (elbow) will begin a throwing program next week, Evan Petzold of the Detroit Free Press reports.
Pacheco was placed on the 60-day injured list by the Tigers on Monday with a right elbow sprain, Evan Petzold of the Detroit Free Press reports.
Pacheco (elbow) was claimed off waivers by the Tigers on Tuesday and optioned to Triple-A Toledo.
Pacheco (elbow) was optioned to Triple-A Memphis on Saturday, Jeff Jones of the Belleville News-Democrat reports.
Pacheco is dealing with elbow tightness and won't throw for the next couple weeks, Jeff Jones of the Belleville News-Democrat reports.