Manager Kevin Cash said Duffy (heel) is expected to go back on his rehab assignment by "mid-week," Steve Carney of Sports Radio 620 WDAE reports.
This is good news after Duffy was pulled back from his regular assignment with general soreness, but there's still no clear timetable as to a possible return date. Cash said the soreness was a consequence of the infielder trying to get up to speed out of the batter's box, likely a symptom of his post-surgery rehabilitation. Regardless, look for Duffy to restart a minor-league rehab assignment sometime within the week.