"It's extremely disappointing to lose him with this much opportunity sitting here for him," Price added.
Moscot suffered the injury while tagging Tigers center fielder Anthony Gose at second base. The rookie had fielded a sharp ground ball hit by Miguel Cabrera and turned to retire Gose, the lead runner. Instead of throwing to second, he pursued Gose toward the bag and awkwardly impacted the ground while completing the play.
After being attended to by training staff, Moscot walked off the diamond gingerly while holding his left arm. He had thrown seven pitches during the brief outing, which was just his third Major League start.
"I feel bad for him," Gose said. "Hopefully, he gets better. Good thing is it's his glove arm -- that's a positive."
Moscot was the first player from the Reds' 2012 Draft class to appear with the club. He had made 77 Minor League outings before being promoted June 5.
Sincere thank you to all the @Reds fans and everyone whos reached out. Theres always a silver lining and I'll be back soon count on it.
"It's tough," Price said. "The kid's worked his tail off to get this opportunity."
Cincinnati replaced Moscot during Monday's game with reliever Pedro Villarreal, who had been recalled from Triple-A Louisville earlier in the afternoon. He tossed 3 1/3 frames and allowed only one unearned run, but took the loss.
Alejandro Zúñiga is an associate reporter for MLB.com. Follow him on Twitter @ByAZuniga. This story was not subject to the approval of Major League Baseball or its clubs.