Contreras (hamstring) took batting practice and ran the bases Thursday, Mark Gonzales of the Chicago Tribune reports.
Contreras continues to make encouraging progress as he works his way back from a strained right hamstring that has kept him on the shelf for most of August. If the backstop responds well to his increased activity, he could be cleared to begin a minor-league rehab assignment later this week or early next week. He's trending toward an early-to-mid-September return, barring setbacks.