Cronin was removed from Thursday's game against the Rockies due to an apparent injury, Christina De Nicola of MLB.com reports.
Cronin was able to remain in the game after his first visit from the Marlins' training staff, though the decision was eventually made to pull him after he had trouble fielding a groundball in the sixth inning. It's not immediately apparent what is bothering the 26-year-old righty, but the team should have more information on his status sometime after the game.