ARLINGTON, Texas – Texas Rangers left-hander Matt Harrison has had a setback in his recovery, needing another operation eight days after surgery to repair a herniated disk in his lower back.

General Manager Jon Daniels said Harrison started feeling pain in his leg. An MRI on Wednesday revealed another herniation in the same disk, and he had additional surgery to resolve that.

Daniels said Harrison came out of the surgery feeling great.

The Rangers don’t expect Harrison back for about three months.

Harrison, an 18-game winner and All-Star last year, started the opener this season, the first of his new $55 million, five-year contract.

ASTROS: Pitcher Jordan Lyles will be recalled from the minors by the Houston Astros to start Thursday night against the AL champion Detroit Tigers.

Drafted 38th overall in June 2008, the 22-year-old Lyles made 40 major league starts over the last two seasons and was 7-20 with a 5.20 ERA in 45 games overall.

The right-hander was expected to be a member of the big league rotation this year but pitched so poorly in spring training that he was sent to Triple-A Oklahoma City, where he is 2-2 with a 5.32 ERA in six outings.

BLUE JAYS: Knuckleballer R.A. Dickey was diagnosed with mild inflammation in his neck and back, and will get an extra day of rest before his next start on Saturday.

INDIANS: First baseman Nick Swisher sat out a second straight game with a sore left shoulder.

Swisher is in a 4-for-28 slump that has dropped his batting average to .265.

NATIONALS: Stephen Strasburg is expected to make his next scheduled start after experiencing no pain during a bullpen session.

CUBS: Club Chairman Tom Ricketts for the first time publicly threatened to move the team out of Wrigley Field if his plans for a big, new video screen are blocked, saying Wednesday he needs new advertising revenue to help bankroll a $500 million renovation of the storied ballpark.

The thorniest issue is a plan for a 6,000-square-foot video screen over left field, a common feature in many major league ballparks. Wrigley Field, however, is surrounded by privately owned clubs with rooftop bleachers whose owners object to any changes that could block their bird’s-eye views into the stadium.