Rodon was scratched from Friday's Cactus League game due to tightness in his biceps, Dan Hayes of CSN Chicago reports.
This isn't promising news for either Rodon or the White Sox. He will head for an MRI, though the team doesn't believe there is any structural damage at this point. Even so, they were moving Rodon along very slowly this spring in anticipation of an increased workload, so if there isn't any structural damage, it's still likely he'll miss some time to start the season. This is obviously a situation to monitor, and more will be known about the southpaw's status after the test results are revealed.