Celtics Vice President of Media Relations Jeff Twiss confirmed Friday morning that Kendrick Perkins suffered a shoulder injury during offseason workouts in Waltham on Thursday.

Twiss said that Perkins will be observed by doctors "in the near future" for further diagnosis. There is no definitive word at this time on the nature of the injury, or any timetable on a return.

Perkins had just returned to Waltham to begin offseason workouts this week. Celtics.com will have more information as it becomes available.

Perkins also suffered a shoulder dislocation last season at practice on February 8.