The Red Sox recalled Bobby Poyner from Triple-A Pawtucket to take Smith's spot on the roster.
Red Sox reliever Carson Smith suffered a potentially "major injury" when he threw his glove in frustration after giving up a home run.
Smith, Sox manager Alex Cora and Sox president Dave Dombrowski all talked with the media about the incident and what's next.
The right-hander has made 18 appearances in 2018, throwing 14 1/3 innings tallying 18 strikeouts. In seven relief appearances over two stints, he allowed two runs on nine hits in eight innings, striking out nine batters and walking one.
Smith told the Globe that he routinely throws his glove without effect.
Cora said the club had no update on Smith's recent injury, and that there would be more tests.
"It caught me by surprise. That's part of my warm-up routine is I go through my throwing motion, I throw my glove - actually I usually hold on to it, sometimes I accidentally release it". He's not the first guy that slams a glove or throws a bat or punches himself. "We have to move on". I think it's a freak accident.
"I think fatigue played a factor with my shoulder, and my shoulder just couldn't handle it", he said.
"Think my shoulder's exhausted in general", he added. "It's just from pitching. I've thrown a lot lately and I think my arm was just exhausted", Smith said, via NBC Boston's Evan Drellich.