Danny Duffy (shoulder) is expected to throw a bullpen session Friday, Andy McCullough of the Kansas City Star reports.

Duffy (shoulder) is expected to throw a bullpen session Friday, Andy McCullough of the Kansas City Star reports.

Analysis:

Duffy was sent to the disabled list Monday due to shoulder soreness, but has begun the rehab process. The move was retroactive to May 17, so he can return as early as June 1. While it seems unlikely he'll be available that early, a return at some point in early-to-mid June doesn't appear out of the question.