Rodon (shoulder) will undergo an MRI on Friday, Daryl Van Schouwen of the Chicago Sun-Times reports.
Rodon's shoulder tightened up on him during warmups Thursday, resulting in his scratch just 15 minutes prior to first pitch. The White Sox understandably want to get the full picture before determining a course of action; after all, Rodon missed the first three months with left shoulder bursitis. Mike Pelfrey started in place of Rodon in the series finale.