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6/3/2014 8:42 P.M. ET

Harrison has career-threatening spine surgery

ARLINGTON -- Rangers pitcher Matt Harrison underwent disc fusion surgery on his back on Tuesday. The surgery was performed by Dr. Drew Dossett and Harrison will be hospitalized for two days.

The Rangers announced no other details, but Harrison is expected to miss the rest of the season. His career is also in doubt. When the Rangers announced last month that Harrison had severe nerve damage in his lower back, they said there was a possibility that surgery would be required.

The chances of recovery from this kind of surgery to the point where Harrison could pitch again are not good. Harrison was operated on twice by Dossett last year to a repair a herniated disc.

Harrison won 32 games for the Rangers in 2011-12. He also signed a five-year, $55 million contract extension in the spring of 2013. But he has been able to pitch in just six games over the past two seasons while dealing with back problems.

Rangers adjust to keep Yu on regular rest

ARLINGTON -- The Rangers have adjusted their rotation so that Yu Darvish will pitch on five days' rest and Nick Tepesch will get extra time off.

Darvish, who pitched Sunday, is now scheduled to start Friday, with Tepesch following him on Saturday. Tepesch lasted two innings in his last start, on Saturday against the Nationals.

The Rangers were off on Monday and normally use their off-days to give all their starters extra rest. But Darvish had missed his previous start because of neck stiffness, so the Rangers didn't feel he needed extra rest. He is also 4-1 with a 1.66 ERA in his last five starts.

"If we get another day off, he may get an extra day," Rangers manager Ron Washington said. "He didn't throw that many pitches on Sunday, so that's good."

Darvish threw 102 pitches against the Nationals over eight innings, while holding them scoreless on five hits and two walks. He struck out 12 and has 41 strikeouts over his past four games.

First string gets back in lineup

ARLINGTON -- First baseman Mitch Moreland and outfielders Shin-Soo Choo and Michael Choice were all back in the Rangers' lineup on Tuesday after sitting out Sunday's game against the Nationals.

Choo is dealing with a sore left ankle, and the Rangers don't expect him to be at full strength the rest of the season. He was at designated hitter on Tuesday and said the two days off helped significantly.

"I think this is the best it's felt since I hurt it," Choo said. "I feel like [manager Ron Washington] really cares about my ankle and has been good about getting me a day off or in the DH spot. I don't like DH, but I want to make the ankle better and we have four months to go."

Moreland missed Sunday with a sore back and left foot. He took a complete day off on Sunday, and that paired nicely with the scheduled off-day on Monday.

"Just the normal aches and pains everybody goes through this time of year," Moreland said.

Choice fouled a ball of his left shin on Wednesday in Minnesota. He played on Thursday, but the shin flared up on the flight to Washington. He spent the weekend getting treatment on it and was back in left field on Monday.

"When I did it, it didn't feel too good, so now I wear a shin guard," Choice said.

Profar doubts he'll play this season

ARLINGTON -- Rangers infielder Jurickson Profar, who is on the disabled list with a torn muscle in his right shoulder, admitted that it's unlikely that he'll play this season.

"I don't think so," Profar said Tuesday in the Rangers' clubhouse.

Profar started the season on the disabled list with the torn muscle and was originally expected to be out 10-12 weeks. But he re-injured the shoulder a couple of weeks ago and was shut down for 10-12 more weeks. Now he is doing nothing but resting it with no baseball activities.

"It's a little bit [frustrating], but a lot of things will get me strong again," Profar said. "I was hoping to be out there helping the team, but at the same time you don't want to play hurt. You don't want to get worse."

Scheppers, Adduci resume rehabs at Frisco

ARLINGTON -- The Rangers sent pitcher Tanner Scheppers to Double-A Frisco on rehab assignment, and he threw one scoreless inning on Tuesday night, needing just six pitches in the eighth inning of the RoughRiders' 3-1 loss to San Antonio.

Scheppers, who is coming back from inflammation in his right elbow, had allowed six runs in four previous rehab games, and the Rangers still see him not quite ready to return. He may pitch back-to-back games before he comes off the disabled list.

Scheppers was the Rangers' top setup reliever last season and manager Ron Washington made it clear they want him back as soon as he is ready.

"If he is ready to pitch for us, nothing is going to stop us from putting him in the bullpen," Washington said.

The Rangers also sent outfielder Jim Adduci to Frisco on rehab assignment. One of his missions will be to re-learn first base, where he started on Tuesday. He went 1-for-4.

Adduci was used exclusively in the outfield before he fractured the little finger on his left hand on April 18. But he has some experience at first base and the Rangers want him to be able to play there when he returns. The Rangers are without an experienced backup at first behind Mitch Moreland and Donnie Murphy had to play there Sunday for the first time in his career.

Rehabbing reliever Bard to pitch in games

ARLINGTON -- The Rangers have transferred pitcher Daniel Bard from extended spring training to Class A Hickory. Bard is the former Red Sox setup reliever who underwent surgery on Jan. 2 to relieve symptoms of thoracic outlet syndrome. He had a rib bone removed that was causing problems in his right arm.

The Rangers signed him to a Minor League contract and he has been doing his work in Surprise, Ariz. Now he will start pitching in games.

"His velocity has been 94-97 mph, and in his last outing in Arizona he showed improved consistency with his command," Rangers pitching coordinator Danny Clark said. "We're excited to see him under the lights. We should no more after he gets 2-3 outings under his belt."

Bard was the 28th-overall pick for the Red Sox in 2006 out of the University of North Carolina. He was in Boston's bullpen from 2009-11, with a record of 5-13 but with a 2.88 ERA and an opponents batting average of .190. He also struck out 213 in 197 innings. The Red Sox tried to turn him into a starter in 2012, and that's when he started having the physical issues that led to Tommy John elbow reconstruction surgery.

Worth noting

• Class A Hickory outfielder Evan Van Hoosier and pitcher Cody Kendall have been selected to the South Atlantic League North Division All-Star team. Van Hoosier, an eighth-round pick in 2013 out of the College of Southern Nevada, is hitting .308 with 13 doubles, five triple, four home runs, 30 RBIs and 33 runs scored in 38 games. Kendall was an eighth-round pick in 2012 out of Fresno State who is 3-2 with a 0.98 ERA in 15 relief appearances.

Alex Rios has been named the Rangers Player of the Month in May after hitting .312 with two home runs, 17 RBIs and 16 runs scored over 28 games. He was also the first Rangers player to hit five triples in any month.

Mitch Moreland lost a double and an RBI because of a scoring change from the May 24 game in Detroit. It was changed to a two-base error.

• The Rangers had Kangaroo Court on the return flight from Washington on Sunday night, fining players for frivolous and stupid infractions. For example, Luis Sardinas was hit for starting for first base after a ball-three call. Prince Fielder was fined for transgressions even though he is out for the season after undergoing neck surgery. Derek Holland was picked on excessively even though he hasn't pitched all year.

T.R. Sullivan is a reporter for MLB.com. Read his blog, Postcards from Elysian Fields, and follow him on Twitter @Sullivan_Ranger. This story was not subject to the approval of Major League Baseball or its clubs.