Duffy (heel) is scheduled to take grounders Saturday and run the bases Sunday and Monday, Marc Topkin of the Tampa Bay Times reports.
Duffy felt good after running the bases for the first time since undergoing heel surgery last September, so he'll continue to ramp up his activity before heading out on a rehab assignment. If Duffy is able to get through the weekend without a hitch, he could be headed out on a rehab assignment sometime next week, though the Rays haven't confirmed a possible return date and figure to continue to be cautious with the 26-year-old. When Duffy does return, he's expected to take over at shortstop for Tim Beckham.