Mateo was removed from Sunday's game against the Tigers with rib cage soreness, Andy Kostka of The Baltimore Sun reports.
The 26-year-old collided with Detroit first baseman Spencer Torkelson while attempting to bunt for a base hit during the second inning, and the middle infielder was forced to leave the contest a couple innings later. Mateo has started 31 of 35 games at shortstop this season, so any absence would be significant for Baltimore.