Club officials said Beltre originally hurt the shoulder diving for a ball in the ninth inning of the first game of the doubleheader Sunday and then aggravated it in the seventh inning of the second game.
"Hopefully it's nothing serious, and I'll be back out there tomorrow," Beltre said. "I knew it was pretty sore, but I couldn't afford to sit. I didn't say anything to anybody. I tried to get through it but (Rangers manager Ron Washington) didn't let me finish."
Beltre reaggravated the injury while leaping with his left arm fully extended above him in an attempt
catch Angels first baseman Mark Trumbo's liner. Beltre
got his glove on the ball, knocking it down. When he put his arm
down, he let the glove fall to the ground and took a few steps.
Washington quickly came out of the dugout with a
trainer to check on Beltre. After a brief discussion, rookie Mike
Olt took over at third base.
Beltre has been dealing with some ailments recently, including an abdominal injury where scar tissue from a previous surgery was rubbing against it. He played through that, missing minimal time.
Beltre is hitting .319 with 36 home runs and 101 RBIs on the season.
Meanwhile, Rangers infielder and designated hitter Michael Young came out of Sunday's nightcap in the middle of the game because of a sore left Achilles tendon.
Young said he could play any infield position except second base with the pain, which has been around for about a month. He said because he has to charge so many balls at second, it was bothering him a bit on Sunday.
Washington saw Young limping a bit after running to first and didn't want to take any chances, so he put Jurickson Profar in the field to take Young's place.
Information from The Associated Press was used in this report.