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5/17/2014 8:03 P.M. ET

Fielder forces Washington to juggle lineup

ARLINGTON -- Manager Ron Washington wasn't planning on juggling his lineup but had to do so Saturday when Prince Fielder had to sit with stiffness in his neck. Fielder, who was been diagnosed with a herniated disk in his neck, is not expected to play Saturday or Sunday.

Shin-Soo Choo dropped from the leadoff spot to No. 3. It's the first time Choo has been out of the leadoff spot this season. Michael Choice batted leadoff with left-hander Mark Buehrle on the mound for the Blue Jays. The other option was to move Alex Rios in the No. 3 spot ahead of cleanup hitter Adrian Beltre, but Washington decided to leave him in the fifth spot.

"Alex doesn't look comfortable there, so I decided to go with Choo there," Washington said. "Put Michael Choice in the top and leave Rios where he is."

Choice has been used in the No. 1 spot when Choo was unavailable earlier this season with a sprained left ankle. He went into Saturday's game hitting .200 but with a .355 on-base percentage in the leadoff spot.

Perez opts for Tommy John surgery

ARLINGTON -- Rangers pitcher Martin Perez, who has a partial tear in the ulnar collateral ligament in his left elbow, has decided to have Tommy John surgery and will be sidelined for at least a year.

The surgery will be done on Monday by Dr. Keith Meister.

"I made the decision because the ligament is not 100 percent," Perez said. "I think it's the best decision for me. It's disappointing but at the same time, I am strong in my mind. That's the way you have to be. I'm good. I have the support of my teammates and my family. I understand the situation."

Perez made the decision after talking to other pitchers who have had the surgery, including teammates Joakim Soria and Colby Lewis.

"They told me it's not easy but if you're strong in your mind, you can do what you have to do," Perez said. "I'll be all right. You can't control the situation. It's happened to a lot of players, now it's happened to me. I'll be all right. It's better for me and better for the team. I'll have the surgery, work hard and be back strong next year."

Perez was 4-0 with a 1.42 ERA in his first five starts. He lost his last three starts but said he didn't feel any pain or discomfort in the elbow until his last start. Perez allowed six runs in 3 2/3 innings in an 8-3 loss to the Red Sox last Saturday.

Rangers won't rush Holland's rehab

ARLINGTON -- Pitcher Derek Holland is feeling great physically but the Rangers are not about to rush him into a medical rehabilitation assignment.

Holland underwent microfracture surgery in January to repair torn cartilage in his left knee and has progressed to the point where he can pitch in simulated games. But the Rangers want to make sure the knee is strong before he goes out and pitches in Minor League games.

"It's all about strengthening the leg," general manager Jon Daniels said. "He's on target and maybe ahead of target. There is still some strengthening needed to build him up and protect the knee. We want him to have confidence and us to have confidence in the knee."

Holland threw approximately 45 pitches in a simulated game in Arizona on Thursday before returning to Arlington this weekend to continue his throwing program. Daniels said Holland will travel with the Rangers on their next road trip, a 10-game swing to Detroit, Minnesota and Washington. He will be re-evaluated at some point during or after the trip.

"We're going to tap the brakes a little bit," Daniel said. "There are no issues, he's doing good. We just want to be smart about it."

Rangers to review medical practices

ARLINGTON -- General manager Jon Daniels said the Rangers are going to review their entire medical and training procedures after all the injuries that have hit the team since the offseason.

"We're looking at everything," Daniels said. "It's a little tough in the middle of it to take a step back. Right now we're trying to get everybody healthy. But we're certainly going to evaluate everything, the process and the practice."

The Rangers made one change last year when head trainer Jamie Reed was promoted to medical trainer, giving him responsibility for overseeing the organization's entire medical operations, including training, conditioning and rehabilitation at both the Major and Minor League levels.

Kevin Harmon and Matt Lucero are the trainers for the Major League team with Jose Vazquez as the strength and conditioning coach. Dr. Keith Meister, whose specialty is orthopedics, is in his 11th season as team physician although the Rangers rely on specialists in a number of other areas.

The Rangers have 13 players on the disabled list, five more than any other team. They have used the disabled list 16 times, four more than any other team. Robbie Ross Jr. is the only current member of the rotation who was on the Opening Day roster.

The Rangers used the disabled list 19 times last season, 12 in 2012 and 19 in 2011 when they last went to the World Series.

Worth noting

• Reliever Neftali Feliz threw a scoreless inning on Friday in Round Rock's 5-1 win over Iowa. It was his second appearance since coming off the disabled list. General manager Jon Daniels said the Rangers would like to see Feliz pitch back-to-back games and a two-inning stint before he is considered an option at the Major League level.

• Class A Myrtle Beach third baseman Joey Gallo is hitting .345 with 17 home runs and 37 RBIs but the Rangers aren't ready to promote him to Double-A Frisco. General manager Jon Daniels said the Rangers will likely wait until June and after the First-Year Player Draft before considering promotions. Said Daniels, "The day we signed him, he had as much power as anybody in baseball. He has made strides in other areas. He has made some strides defensively and made some strides with his [hitting] approach and plate coverage."

• Catcher Brett Nicholas has been activated off the inactive list at Triple-A Round Rock.

• Pitcher Justin Germano has cleared waivers and is trying to decide if he'll accept outright assignment to Triple-A Round Rock. He was designated for assignment on Wednesday.

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.