Tigers officials said Guillen had a mild left groin strain. He is listed as day-to-day.
Guillen was 1-for-3 with an RBI single at the time of the injury. For the season, the 10-year veteran is hitting .317 (60-for-189) with 14 doubles, four triples, six home runs and 37 RBIs, which is second on the team only to Magglio Ordonez (48).
Dawn Klemish is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.