"He reported some discomfort in the left forearm," assistant general manager Thad Levine said. "It's just a muscular issue. We felt at this time of year, we're getting reinforcements, so this is a good time to take advantage of that and give him some down time to rest."
In addition to Profar, the Rangers are calling up their No. 2 prospect, left-handed pitcher Martin Perez, along with right-handers Tanner Scheppers and Yoshinori Tateyama, infielder Brandon Snyder and outfielder Leonys Martin.
The Rangers also made some other moves. Pitcher Miguel de los Santos was designated for assignment so he could be removed from the 40-man roster. The Rangers need room for reliever Tyler Tufts, who was called up from the Minors and placed on the 15-day DL. He is sidelined after undergoing surgery to repair a perforated bowel.
By placing Tufts on the DL, the Rangers gain flexibility when it comes time to put together their playoff roster. They can replace Tufts with any player within the organization, even if he wasn't on the 25-man roster on Aug. 31.
That means that any of the players called up on Saturday, including Profar, could replace Tufts on the postseason roster.
Profar, 19, is the only one being called up who does not have Major League experience. He spent the entire season at Double-A Frisco and hit .281 with 76 runs scored, 14 home runs, 62 RBIs and 16 stolen bases. He had a .368 on-base percentage and a .452 slugging percentage. He played 97 games at shortstop, 25 at second base and one at third base.
"He'll play some shortstop, and he'll play some second base when I can get him the opportunity," manager Ron Washington said. "He may pinch-run, and there may be some opportunities to pinch-hit, being a switch-hitter. His season has gone great. He has a lot of maturity."
Perez, who pitched in six games for the Rangers earlier this season, gives Texas a second left-hander in the bullpen behind Michael Kirkman now that Ross is out. He can also pitch multiple innings and start if needed. The 21-year-old was 7-6 with a 4.38 ERA in 21 starts and one relief appearance with Round Rock. He was with the Rangers twice this season and went 1-1 with a 4.05 ERA in three starts and three relief appearances.
Martin is a left-handed-hitting center fielder who also adds speed to the bench. He has been with the Rangers twice, from June 15 to July 30 and again from Aug. 17-20. While in the big leagues, he went 7-for-38 with four doubles and two triples. He played in 55 games for Round Rock and hit .359 with a .422 on-base percentage and .610 slugging percentage to go with 12 home runs, 42 RBIs and 10 stolen bases.
Tateyama went 4-0 with a 1.13 ERA and six saves in 32 games for Round Rock. Over the past two years, he has pitched in 50 games for the Rangers and is 3-0 with a 6.04 ERA. He has allowed 12 home runs in 56 2/3 innings in the big leagues.
Snyder was with the Rangers on Opening Day and remained in the big leagues until Aug. 1, when the Rangers called up Mike Olt. Snyder played in 38 games for the Rangers and hit .281 with three home runs and nine RBIs. He played in 23 games for Round Rock and hit .253 with two home runs and nine RBIs.
Scheppers went 1-0 with a 4.56 ERA in 29 games for the Rangers before being sent down last Sunday, and technically, he is the one replacing Ross on the roster. Because he is replacing an injured player, Scheppers does not have to wait the minimum of 10 days before being called back up.