"Everything points toward that tendon having let go last night -- which, in this case, is a positive," said Red Sox manager John Farrell. "How many days it takes to recover, we'll see. But the 15 days should hopefully help this quiet down to the point of him returning."
With Ross out, Dan Butler was recalled from Triple-A Pawtucket for his first stint in the Majors. Butler was not in Saturday's starting lineup.
"You can't really describe it," said Butler. "I'm sure you guys have heard this every time everybody has come up. You can't explain how exciting this is."
Butler spent time with the Red Sox the last two Spring Trainings.
"He's always had a strong reputation of handling pitchers [with] his game-calling," said Farrell. "In some ways, it's a real success story when you factor in that he's been a non-drafted free agent signed out of the Cape Cod League, he was a backup catcher in college -- and with all of his work, it's paid off [with] a Major League opportunity."
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. Quinn Roberts is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.