Kintzler has been diagnosed with a mild left oblique strain, Mark Gonzales of the Chicago Tribune reports.
Kintzler has reportedly been dealing with a nagging oblique injury of late, which may explain his struggles in his last outing. He surrendered two runs on three hits over one-third of an inning Tuesday against San Diego. Per Jordan Bastian of MLB.com, Kintzler has been throwing, but he hasn't been cleared to return to game action just yet.