Stauffer (strained intercostal) will begin a rehab assignment with Triple-A Rochester on Tuesday, Mike Berardino of the St. Paul Pioneer Press reports. Stauffer should rejoin the Twins at some point in mid-to-late May, but his middle/long-relief role doesn't figure to change. He struggled before the injury, turning in an 8.38 ERA, 2.28 WHIP and 2:6 K:BB ratio over 9.2 innings.