Antone was removed from Tuesday's game at Milwaukee with an apparent right arm injury, Mark Sheldon of MLB.com reports.
The right-hander was activated from the injured list earlier in the day after missing nearly two months with an forearm strain, and he exited Tuesday's contest after visibly wincing on only his fifth pitch. The specifics of the issue remain unclear, but it's a tough break for Antone in his first game back from an extended absence.