McCann (wrist) will begin a rehab assignment at Double-A Binghamton on Thursday, Tim Britton of The Athletic report.
McCann has been sidelined for just over a month due to a broken wrist, but he's been cleared to return to game action in the minors. While the 32-year-old will likely require several rehab games given the length of his absence, he seems to be on track to return from the injured list sometime in late June.