Kimbrel (knee) underwent successful left knee arthroscopy and partial medial meniscectomy Monday and will be out 3-6 weeks, Evan Drellich of the Boston Herald reports.
Kimbrel's surgery went according to plan. He will now begin the rehab and recovery phase in an attempt to get back to full strength. The 28-year-old has a career high 3.55 ERA through 34 games for the Red Sox but has still converted on 17 of his 19 save opportunities.