Moncada, who went 4-for-19 in eight games with Boston after spending most of the year between Class A Advanced Salem and Double-A Portland, had been playing for the Surprise Saguaros in the Fall League and was doing well, slashing .292/.370/.458 with a home run and three RBIs in 24 at-bats, before the incident Friday night.
Moncada was lifted for a pinch-hitter in that game against the Salt River Rafters and hasn't returned to action since.
"It's been a little sore, but he's supposed to start baseball activity tomorrow," Saguaros manager Carlos Febles said on Tuesday. "So hopefully he'll start playing on Friday."
Doug Miller is a reporter for MLB.com. Follow him on Twitter @DougMillerMLB. This story was not subject to the approval of Major League Baseball or its clubs.