The 23-year-old left-hander is confident that he'll be back before the end of the season, but doesn't know when.
• Lefty reliever Joe Thatcher got an MRI exam on Monday that confirmed a ligament sprain in his left ankle. Thatcher, wearing a walking boot, is hoping to make it back in three to four weeks, calling it "a pretty straightforward rehab."
Alden Gonzalez is a reporter for MLB.com. Read his blog, Gonzo and "The Show", and follow him on Twitter @Alden_Gonzalez. This story was not subject to the approval of Major League Baseball or its clubs.