Texas manager Ron Washington said Beltre could be back in the lineup against Boston on Tuesday night. The Rangers have an off day Monday.
"I was concerned at first, but once I got the news, I'm not," Washington said. "A couple of days and he should be back in there."
Beltre came out of Saturday's game against the Royals after the ninth inning. The Rangers lost 4-1 in 10 innings.
Beltre aggravated his hamstring running the bases in the fourth inning.
The three-time All-Star is hitting .305 with 11 home runs and 34 RBIs this season.
Todd Wills covers the Rangers for ESPNDallas.com. Information from The Associated Press was used in this report.