"He's sore today," said Red Sox manager John Farrell on Saturday. "He's probably going to need a couple of days to get over the impact of last night."
Though Jackie Bradley Jr. continues to perform well at Triple-A Pawtucket, the Red Sox don't seem inclined to make a roster move just to cover for Betts in the short term.
"With Brock [Holt] being able to move all over the field, we're covered," said Farrell. "So we're not looking to make any kind of roster change, right now."
Rusney Castillo got the start in center on Saturday.
Fortunately, Betts was not concussed and doesn't have any injuries beyond his back.
"It was kind of remarkable that there wasn't more going on," Farrell said. "As his next at-bat was approaching, because he hits with that leg kick, he can't fire that -- and that's where the stiffness and the sprain in the low, left side of the back is restricting him."
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.