Mondesi will undergo an MRI on his left shoulder after leaving Tuesday's game versus the White Sox, Jeffrey Flanagan of MLB.com reports.
Mondesi sustained the injury when diving for a foul ball during the fifth inning, and the athletic trainer held Mondesi's left arm as he exited the field. Per Flanagan, teammate Hunter Dozier said Mondesi believed he suffered a dislocated left shoulder, but there won't be an official diagnosis until after the MRI.