Duffy (heel) is expected to start his minor-league rehab assignment with High-A Charlotte on Tuesday, Roger Mooney of the Tampa Bay Times reports.
After an encouraging day of workouts Monday that saw him push his running to 90 percent, it appears Duffy is finally nearing a return to big-league action. While manager Kevin Cash refused to specify how long the rehab assignment might be, Duffy said he hopes to be back with the Rays in around two weeks. The 26-year-old is expected to take over for Tim Beckham as the primary shortstop upon his activation.