"We want to be cautious with him, and we will continue to be," Francona said. "He's making progress. He can already tell, just by even like touching it and moving it and things like that. And he got a good examination and we'll continue to monitor that."
In 11 starts this season, McAllister is 4-5 with a 3.43 ERA. He gave up a season-high five runs on June 2 against Tampa Bay, during which he had difficulties throwing his curveball.
"Now, we are going to be cautious with him, because this isn't something to play around with," Francona said. "And if we do treat it correctly and accordingly, he should be just fine, and that's the whole idea."
Mark Emery is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.