Infante batted twice, striking out the last time. In that final at-bat, he appeared to be stretching that left side.
Oblique strains can take three to four weeks of recovery.
Infante is coming off a career-high seven RBI-game against Cleveland on Thursday.
Jeffrey Flanagan is a reporter for MLB.com. Follow him on Twitter at @FlannyMLB. This story was not subject to the approval of Major League Baseball or its clubs.