Matt Harrison underwent spinal fusion surgery on Tuesday.
Rangers placed LHP Matt Harrison on the 15-day disabled list with lower back inflammation.
Matt Harrison (back) has a displacement of a vertebra in his back and could be faced with spinal fusion surgery.
MLB.com's T.R. Sullivan reports that Matt Harrison (back) "is expected to miss at least one start if not be out for an extended period of time."
Matt Harrison left Tuesday's start against the Astros with back stiffness.
Matt Harrison left Tuesday's start against the Astros in the second inning with an apparent injury.
Matt Harrison earned his first win, shutting the Rockies out over 5 1/3 innings as the Rangers went on to win 5-0 on Thursday.
Matt Harrison yielded three runs and 10 hits in 4 1/3 innings Saturday against the Angels.
Matt Harrison allowed two runs over six innings in a no-decision against the Mariners on Sunday.
Rangers activated LHP Matt Harrison from the 15-day disabled list.
Matt Harrison (back) will rejoin the Rangers' rotation on Sunday in Seattle.
Matt Harrison (back) is on pace to rejoin the Rangers' rotation on Friday.
Rangers general manager Jon Daniels said in an interview Sunday that Matt Harrison's (back) next start is expected to come at the major league level.
Matt Harrison (back) is expected to make a few more minor league rehab starts.