"He continues to show improvement but is he ready for rehab?" Red Sox manager John Farrell said. "The symptoms are there but they're diminishing."
• Infielder Travis Shaw was out of Wednesday's lineup with left-hander Madison Bumgarner starting for the Giants.
"It gives us a chance to get another right-hander in there against Bumgarner," Farrell said.
• Infielder Xander Bogaerts continues to impress Farrell with baseball wisdom beyond his years.
"What we're seeing is a guy doing things not normal for a 23-year-old," said the manager. "You're seeing him grow in every way."
Rick Eymer is a contributor to MLB.com and covered the Red Sox on Wednesday. This story was not subject to the approval of Major League Baseball or its clubs.