Jun 23, 2010 6:43 PM EST

Dustin McGowan underwent surgery for a torn rotator cuff and will miss at least the end of this season and possibly the start of the 2011 campaign.

Dr. James Andrews found the torn rotator cuff during surgery on the right- hander's pitching shoulder Tuesday. McGowan isn't expected to resume throwing for about 4-to-6 months.

Via Toronto Sun