The White Sox third baseman walked to first base but was replaced by pinch-runner Jason Bourgeois. Fields suffered a right forearm bruise but no X-rays were necessary. He is listed as day-to-day.
White Sox manager Ozzie Guillen expects Fields to miss a couple of games, although he had not consulted with the White Sox training staff at the time of his postgame meeting with the media following Wednesday's 10-10 deadlock with the Rockies.
"He's lucky something worse didn't happen," said Guillen of Fields, who was struck between the right forearm and wrist, according to Guillen. "Let's put it this way. It hit him in the right spot. He got hit pretty good."
Entering Wednesday's contest with Colorado, Fields was hitting .429 over his last four games and .242 for the spring.
Scott Merkin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.