Dan Haren underwent arthroscopic surgery on his left shoulder on Wednesday, Bill Shaikin of the Los Angeles Times reports.

Haren underwent arthroscopic surgery on his left shoulder Wednesday, Bill Shaikin of the Los Angeles Times reports.

Analysis:

The procedure was done to deal with slight swelling in his shoulder, though it apparently wasn't serious enough to hold him out from any action during the season. He'll begin the rehab process in a week and expects to be back to full health for spring training.