"I felt great," he said, according to the Providence Journal. "I really expected to come here and feel some tightness when I got done. I don't feel any, so that's a good sign."
He's expected to be in Pawtucket through Friday before returning to the Red Sox when he's eligible to be activated from the disabled list on Saturday.
"We'll re-evaluate where things are at that point," said Red Sox manager John Farrell.
Jose Iglesias has been filling in for Middlebrooks at third.
Jason Mastrodonato is a reporter for MLB.com. Follow him on Twitter @jmastrodonato. This story was not subject to the approval of Major League Baseball or its clubs.