© 2014 MLB Advanced Media, L.P. All rights reserved.

8/16/2014 12:36 A.M. ET

Holland not expected until September

ARLINGTON -- The Rangers need a fifth starter on Aug. 26, but it's not expected to be Derek Holland, who has been on the disabled list all season while recovering from offseason surgery on his left knee.

The Rangers are not expecting Holland to be back until September if at all. Holland made his fourth start on a medical rehabilitation assignment Thursday night in Round Rock and allowed three runs (one earned) on four hits, two walks and four strikeouts. He threw 72 pitches.

"That isn't ready," manager Ron Washington said. "Some of the runs they got off him, there were a couple of errors behind him that made him throw more pitches. Maybe his line would have been better and he would have pitched four or five innings. It didn't work out that way."

Holland will likely shoot for 85-90 pitches in his next outing. But the Rangers want to see him do more than build up his pitch count. He needs to get people out and dominate some Minor League hitters.

"We want him to do what he has to do," Washington said. "Derek will be down there as long as we need him down there."

Rangers go to four-man rotation with Yu on DL, off-days

ARLINGTON -- The Rangers, taking advantage of two off-days next week, are temporarily down to a four-man rotation after optioning pitcher Robbie Ross Jr. back to Triple-A on Friday. They won't need a fifth starter until Aug. 26 against the Mariners.

Manager Ron Washington is hoping it will be Yu Darvish.

"That's our intention," Washington said. "I don't know why he wouldn't. Nothing has been discussed along any other lines."

Darvish is on the disabled list with what has been diagnosed as mild inflammation in his right elbow. The Rangers don't believe it is serious, but will wait until Darvish starts throwing again before they decide anything definitively.

There have been suggestions that Darvish would still be pitching if the Rangers were in a pennant race. Washington made it clear he didn't want to hear that.

"We're in a race," Washington said. "We're in a race to win ballgames."

Washington, speaking in his office before Friday's game with the Angels, also made it clear he didn't think inflammation was that serious of an issue.

"I have inflammation and I'm ready to go out and throw batting practice," said Washington, who has spoken privately with Darvish.

The Rangers are scheduled to pitch Colby Lewis on Saturday and Nick Tepesch on Sunday. They are off Monday before opening a two-game series with the Marlins on Tuesday. Miles Mikolas and Nick Martinez are schedule to pitch that series against right-handers Nathan Eovaldi and Brad Penny for the Marlins.

Lewis, Tepesch and Martinez are scheduled to pitch the three-game series against the Royals next weekend in Arlington. The Royals are tentatively scheduled to pitch right-handers Yordano Ventura and Jeremy Guthrie and left-hander Jason Vargas.

Edwards escapes jam in big league debut

ARLINGTON -- The Rangers called up pitcher Jon Edwards from Triple-A Round Rock on Friday, completing an impressive odyssey out of nearby Keller High School.

He ended up having a memorable Major League debut during the Rangers' 5-4 loss to the Angels.

Edwards entered the game in the top of the eighth inning and the Rangers trailed 5-1. The first batter he faced was Albert Pujols.

"A lot of excitement … a lot of emotions," Edwards said. "I don't think it was nerves, mostly excitement. It was surreal to see Albert Pujols step in the box."

Edwards got Pujols to pop out on a full-count fastball. Josh Hamilton singled and Howie Kendrick walked, but Edwards struck out Erick Aybar on a knee-buckling 2-2 slider.

"He had some nerves working and at times he overthrew his fastball," manager Ron Washington said. "But he dropped that breaking ball in on Aybar … he's going to be OK."

Edwards was drafted in the 14th round of the 2006 First-Year Draft by the Cardinals as an outfielder. He spent five years in their system before being released at the end of the 2010 season. In 2011, he played for independent leagues in Pecos and San Angelo and gradually converted into a pitcher.

Rangers scout Bobby Crook signed him as a pitcher three years ago and he has slowly clawed his way through the system. He was 1-1 with a 2.87 ERA in 12 games at Round Rock, allowing 15 hits and nine walks with 26 strikeouts in 152/3 innings.

Rios undergoes pregame ankle test

ARLINGTON -- Outfielder Alex Rios was on the field 4 1/2 hours before Friday's game with the Angels. The Rangers wanted Rios to go through a series of tests on his right ankle to make sure he was good enough to play right field.

The Rangers decided he was, so Shin-Soo Choo, who is dealing with a sprained left ankle, was used at designated hitter.

"We wanted to see if Rios could play defense," manager Ron Washington said. "We made it known to him, don't start something you can't finish."

Rios, who originally sustained the injury in the second game after the All-Star break, said he was good enough all the ankle continues to bother him.

"I'll have to deal with a little bit of pain but hopefully it won't affect my performance," Rios said. "I'm good enough to be playing tonight."

Worth noting

• The Rangers have sent Triple-A right-hander Justin Germano to the Dodgers for future considerations. He pitched in two games for the Rangers earlier this season.

• The Rangers have promoted outfielder Nick Williams from Class Myrtle Beach to Double-A Frisco. Williams, the Rangers' No. 4 prospect according to MLB.Com, was a second-round pick in 2012. He played in 94 games at Myrtle Beach and hit .292 with 13 home runs, 70 RBIs and a .491 slugging percentage.

• Phil Klein pitched 2 2/3 scoreless innings for the Rangers on Thursday, retiring eight straight batters with five strikeouts. After allowing home runs in his first two outings, Klein has pitched 4 2/3 scoreless innings, allowed one hit and struck out seven.

Said Klein, "I just went out there and did what I have been doing all year: fastball/slider, just keep the ball down, in and out, see what happens."

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.