Junk has been diagnosed with a Grade 1 mild right ankle sprain, Christina De Nicola of MLB.com reports.
Junk suffered the injury during a drill Tuesday. It's unclear when the righty might be ready to pitch in games, but he said Thursday that he's "not concerned that this is gonna be a multi-week thing." While the injury is minor, it will not help Junk's bid for a spot in the Marlins' rotation.